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  • PASS Summit 2011 &ndash; Part IV

    - by Tara Kizer
    This is the final blog for my PASS Summit 2011 series.  Well okay, a mini-series, I guess. On the last day of the conference, I attended Keith Elmore’ and Boris Baryshnikov’s (both from Microsoft) “Introducing the Microsoft SQL Server Code Named “Denali” Performance Dashboard Reports, Jeremiah Peschka’s (blog|twitter) “Rewrite your T-SQL for Great Good!”, and Kimberly Tripp’s (blog|twitter) “Isolated Disasters in VLDBs”. Keith and Boris talked about the lifecycle of a session, figuring out the running time and the waiting time.  They pointed out the transient nature of the reports.  You could be drilling into it to uncover a problem, but the session may have ended by the time you’ve drilled all of the way down.  Also, the reports are for troubleshooting live problems and not historical ones.  You can use Management Data Warehouse for historical troubleshooting.  The reports provide similar benefits to the Activity Monitor, however Activity Monitor doesn’t provide context sensitive drill through. One thing I learned in Keith’s and Boris’ session was that the buffer cache hit ratio should really never be below 87% due to the read-ahead mechanism in SQL Server.  When a page is read, it will read the entire extent.  So for every page read, you get 7 more read.  If you need any of those 7 extra pages, well they are already in cache.  I had a lot of fun in Jeremiah’s session about refactoring code plus I learned a lot.  His slides were visually presented in a fun way, which just made for a more upbeat presentation.  Jeremiah says that before you start refactoring, you should look at your system.  Investigate missing or too many indexes, out-of-date statistics, and other areas that could be leading to your code running slow.  He talked about code standards.  He suggested using common abbreviations for aliases instead of one-letter aliases.  I’m a big offender of one-letter aliases, but he makes a good point.  He said that join order does not matter to the optimizer, but it does matter to those who have to read your code.  Now let’s get into refactoring! Eliminate useless things – useless/unneeded joins and columns.  If you don’t need it, get rid of it! Instead of using DISTINCT/JOIN, replace with EXISTS Simplify your conditions; use UNION or better yet UNION ALL instead of OR to avoid a scan and use indexes for each union query Branching logic – instead of IF this, IF that, and on and on…use dynamic SQL (sp_executesql, please!) or use a parameterized query in the application Correlated subqueries – YUCK! Replace with a join Eliminate repeated patterns Last, but certainly not least, was Kimberly’s session.  Kimberly is my favorite speaker.  I attended her two-day pre-conference seminar at PASS Summit 2005 as well as a SQL Immersion Event last December.  Did I mention she’s my favorite speaker?  Okay, enough of that. Kimberly’s session was packed with demos.  I had seen some of it in the SQL Immersion Event, but it was very nice to get a refresher on these, especially since I’ve got a VLDB with some growing pains.  One key takeaway from her session is the idea to use a log shipping solution with a load delay, such as 6, 8, or 24 hours behind the primary.  In the case of say an accidentally dropped table in a VLDB, we could retrieve it from the secondary database rather than waiting an eternity for a restore to complete.  Kimberly let us know that in SQL Server 2012 (it finally has a name!), online rebuilds are supported even if there are LOB columns in your table.  This will simplify custom code that intelligently figures out if an online rebuild is possible. There was actually one last time slot for sessions that day, but I had an airplane to catch and my kids to see!

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  • Rebuilding CoasterBuzz, Part IV: Dependency injection, it's what's for breakfast

    - by Jeff
    (Repost from my personal blog.) This is another post in a series about rebuilding one of my Web sites, which has been around for 12 years. I hope to relaunch soon. More: Part I: Evolution, and death to WCF Part II: Hot data objects Part III: The architecture using the "Web stack of love" If anything generally good for the craft has come out of the rise of ASP.NET MVC, it's that people are more likely to use dependency injection, and loosely couple the pieces parts of their applications. A lot of the emphasis on coding this way has been to facilitate unit testing, and that's awesome. Unit testing makes me feel a lot less like a hack, and a lot more confident in what I'm doing. Dependency injection is pretty straight forward. It says, "Given an instance of this class, I need instances of other classes, defined not by their concrete implementations, but their interfaces." Probably the first place a developer exercises this in when having a class talk to some kind of data repository. For a very simple example, pretend the FooService has to get some Foo. It looks like this: public class FooService {    public FooService(IFooRepository fooRepo)    {       _fooRepo = fooRepo;    }    private readonly IFooRepository _fooRepo;    public Foo GetMeFoo()    {       return _fooRepo.FooFromDatabase();    } } When we need the FooService, we ask the dependency container to get it for us. It says, "You'll need an IFooRepository in that, so let me see what that's mapped to, and put it in there for you." Why is this good for you? It's good because your FooService doesn't know or care about how you get some foo. You can stub out what the methods and properties on a fake IFooRepository might return, and test just the FooService. I don't want to get too far into unit testing, but it's the most commonly cited reason to use DI containers in MVC. What I wanted to mention is how there's another benefit in a project like mine, where I have to glue together a bunch of stuff. For example, when I have someone sign up for a new account on CoasterBuzz, I'm actually using POP Forums' new account mailer, which composes a bunch of text that includes a link to verify your account. The thing is, I want to use custom text and some other logic that's specific to CoasterBuzz. To accomplish this, I make a new class that inherits from the forum's NewAccountMailer, and override some stuff. Easy enough. Then I use Ninject, the DI container I'm using, to unbind the forum's implementation, and substitute my own. Ninject uses something called a NinjectModule to bind interfaces to concrete implementations. The forum has its own module, and then the CoasterBuzz module is loaded second. The CB module has two lines of code to swap out the mailer implementation: Unbind<PopForums.Email.INewAccountMailer>(); Bind<PopForums.Email.INewAccountMailer>().To<CbNewAccountMailer>(); Piece of cake! Now, when code asks the DI container for an INewAccountMailer, it gets my custom implementation instead. This is a lot easier to deal with than some of the alternatives. I could do some copy-paste, but then I'm not using well-tested code from the forum. I could write stuff from scratch, but then I'm throwing away a bunch of logic I've already written (in this case, stuff around e-mail, e-mail settings, mail delivery failures). There are other places where the DI container comes in handy. For example, CoasterBuzz does a number of custom things with user profiles, and special content for paid members. It uses the forum as the core piece to managing users, so I can ask the container to get me instances of classes that do user lookups, for example, and have zero care about how the forum handles database calls, configuration, etc. What a great world to live in, compared to ten years ago. Sure, the primary interest in DI is around the "separation of concerns" and facilitating unit testing, but as your library grows and you use more open source, it starts to be the glue that pulls everything together.

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  • Stumbling Through: Visual Studio 2010 (Part IV)

    So finally we get to the fun part the fruits of all of our middle-tier/back end labors of generating classes to interface with an XML data source that the previous posts were about can now be presented quickly and easily to an end user.  I think.  Well see.  Well be using a WPF window to display all of our various MFL information that weve collected in the two XML files, and well provide a means of adding, updating and deleting each of these entities using as little code as possible.  Additionally, I would like to dig into the performance of this solution as well as the flexibility of it if were were to modify the underlying XML schema.  So first things first, lets create a WPF project and include our xml data in a data folder within.  On the main window, well drag out the following controls: A combo box to contain all of the teams A list box to show the players of the selected team, along with add/delete player buttons A text box tied to the selected players name, with a save button to save any changes made to the player name A combo box of all the available positions, tied to the currently selected players position A data grid tied to the statistics of the currently selected player, with add/delete statistic buttons This monstrosity of a form and its associated project will look like this (dont forget to reference the DataFoundation project from the Presentation project): To get to the visual data binding, as we learned in a previous post, you have to first make sure the project containing your bindable classes is compiled.  Do so, and then open the Data Sources pane to add a reference to the Teams and Positions classes in the DataFoundation project: Why only Team and Position?  Well, we will get to Players from Teams, and Statistics from Players so no need to make an interface for them as well see in a second.  As for Positions, well need a way to bind the dropdown to ALL positions they dont appear underneath any of the other classes so we need to reference it directly.  After adding these guys, expand every node in your Data Sources pane and see how the Team node allows you to drill into Players and then Statistics.  This is why there was no need to bring in a reference to those classes for the UI we are designing: Now for the seriously hard work of binding all of our controls to the correct data sources.  Drag the following items from the Data Sources pane to the specified control on the window design canvas: Team.Name > Teams combo box Team.Players.Name > Players list box Team.Players.Name > Player name text box Team.Players.Statistics > Statistics data grid Position.Name > Positions combo box That is it!  Really?  Well, no, not really there is one caveat here in that the Positions combo box is not bound the selected players position.  To do so, we will apply a binding to the position combo boxs SelectedValue to point to the current players PositionId value: That should do the trick now, all we need to worry about is loading the actual data.  Sadly, it appears as if we will need to drop to code in order to invoke our IO methods to load all teams and positions.  At least Visual Studio kindly created the stubs for us to do so, ultimately the code should look like this: Note the weirdness with the InitializeDataFiles call that is my current means of telling an IO where to load the data for each of the entities.  I havent thought of a more intuitive way than that yet, but do note that all data is loaded from Teams.xml besides for positions, which is loaded from Lookups.xml.   I think that may be all we need to do to at least load all of the data, lets run it and see: Yay!  All of our glorious data is being displayed!  Er, wait, whats up with the position dropdown?  Why is it red?  Lets select the RB and see if everything updates: Crap, the position didnt update to reflect the selected player, but everything else did.  Where did we go wrong in binding the position to the selected player?  Thinking about it a bit and comparing it to how traditional data binding works, I realize that we never set the value member (or some similar property) to tell the control to join the Id of the source (positions) to the position Id of the player.  I dont see a similar property to that on the combo box control, but I do see a property named SelectedValuePath that might be it, so I set it to Id and run the app again: Hey, all right!  No red box around the positions combo box.  Unfortunately, selecting the RB does not update the dropdown to point to Runningback.  Hmmm.  Now what could it be?  Maybe the problem is that we are loading teams before we are loading positions, so when it binds position Id, all of the positions arent loaded yet.  I went to the code behind and switched things so position loads first and no dice.  Same result when I run.  Why?  WHY?  Ok, ok, calm down, take a deep breath.  Get something with caffeine or sugar (preferably both) and think rationally. Ok, gigantic chocolate chip cookie and a mountain dew chaser have never let me down in the past, so dont fail me now!  Ah ha!  of course!  I didnt even have to finish the mountain dew and I think Ive got it:  Data Context.  By default, when setting on the selected value binding for the dropdown, the data context was list_team.  I dont even know what the heck list_team is, we want it to be bound to our team players view source resource instead, like this: Running it now and selecting the various players: Done and done.  Everything read and bound, thank you caffeine and sugar!  Oh, and thank you Visual Studio 2010.  Lets wire up some of those buttons now There has got to be a better way to do this, but it works for now.  What the add player button does is add a new player object to the currently selected team.  Unfortunately, I couldnt get the new object to automatically show up in the players list (something about not using an observable collection gotta look into this) so I just save the change immediately and reload the screen.  Terrible, but it works: Lets go after something easier:  The save button.  By default, as we type in new text for the players name, it is showing up in the list box as updated.  Cool!  Why couldnt my add new player logic do that?  Anyway, the save button should be as simple as invoking MFL.IO.Save for the selected player, like this: MFL.IO.Save((MFL.Player)lbTeamPlayers.SelectedItem, true); Surprisingly, that worked on the first try.  Lets see if we get as lucky with the Delete player button: MFL.IO.Delete((MFL.Player)lbTeamPlayers.SelectedItem); Refresh(); Note the use of the Refresh method again I cant seem to figure out why updates to the underlying data source are immediately reflected, but adds and deletes are not.  That is a problem for another day, and again my hunch is that I should be binding to something more complex than IEnumerable (like observable collection). Now that an example of the basic CRUD methods are wired up, I want to quickly investigate the performance of this beast.  Im going to make a special button to add 30 teams, each with 50 players and 10 seasons worth of stats.  If my math is right, that will end up with 15000 rows of data, a pretty hefty amount for an XML file.  The save of all this new data took a little over a minute, but that is acceptable because we wouldnt typically be saving batches of 15k records, and the resulting XML file size is a little over a megabyte.  Not huge, but big enough to see some read performance numbers or so I thought.  It reads this file and renders the first team in under a second.  That is unbelievable, but we are lazy loading and the file really wasnt that big.  I will increase it to 50 teams with 100 players and 20 seasons each - 100,000 rows.  It took a year and a half to save all of that data, and resulted in an 8 megabyte file.  Seriously, if you are loading XML files this large, get a freaking database!  Despite this, it STILL takes under a second to load and render the first team, which is interesting mostly because I thought that it was loading that entire 8 MB XML file behind the scenes.  I have to say that I am quite impressed with the performance of the LINQ to XML approach, particularly since I took no efforts to optimize any of this code and was fairly new to the concept from the start.  There might be some merit to this little project after all Look out SQL Server and Oracle, use XML files instead!  Next up, I am going to completely pull the rug out from under the UI and change a number of entities in our model.  How well will the code be regenerated?  How much effort will be required to tie things back together in the UI?Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • SQLBits IV Conference

    I am very proud to announce that I will be presenting at this free conference in Manchester on 28.03.2009.  My session will be on mixing SSIS and Data Mining.  It is a free conference organized by people giving up their own time and is aimed at the community.  Everybody I know who has ever been always says that they enjoyed it.   For more details go to www.SQLBits.com

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  • Part 2: Career development as a Software Developer without becoming a manager.

    - by albertpascual
    Seems like my previous post inspired by the work of Michael “Doc” Norton was a great success for the amount of emails I have received. Yet amazed how many people didn’t want to discuss their questions in the comments  sections. I would encourage people to be more public, still I would like to reply to all of you on this public media. I still welcome those emails. What I found out is that many people feels like me, they want to be developers and still be compensated for their experience without wanting to take a job as a manager. Their perfect day is a full day of coding and learning. Many believe their companies will never pay a manager’s salary to a developer no matter what. Most of you ask how to get the ball rolling. And is the later that I’m addressing here, the previous group, will never try. What companies understand developers value and where can I find them? This is a very difficult question to ask, I don’t have a list of those companies or departments, I have seen in my past signs in companies bending backwards to compensate, in more ways the monetary, a developer that is a good resource to them. Allowing the person to move out of the state and still let them work for the company from home is a sign that company goes by individual cases. Allowing them to go to conference that will not benefit the company is another big sign. Simple signs like flexible hours and letting some people work from home. To see those signs you need to be working in that company for awhile and look at the departments where the manager is taking care of their employees in individual cases. Look for the department where people get quiet extra perks, where some people in the department work from home or remotely. In my experience, but not always true, medium to big companies, are prompt to recognize good developers. Then again, some companies just don’t get it and is when you see many technical people managing developers. For all the people that email me stating that developers can also be very good managers, I do not disagree, I just think that a good developers loves writing code, when you remove that part the better salary isn’t enough to keep a developer happy. Burned out developers appreciate being promoted to managers. How do I know I work in a bad company? In my experience I have been a consultant and seen many companies, a few signs I have learned about companies that will not recognize good developers are: When the turn over is pretty high, when developers are moving out in a big rate, no rocket scientist needs to tap you in the shoulder. When the company is looking always to outsource their development resources. The product is not that interesting nor the company cares too much for their final result and support. Code sweat shops. You’ll know when you start working in one of those. Run for the hills! Where do I start? Disclaimer: I have only based this post on Michael “Doc” Norton, this is just my interpretation and ideas. First thing is to look at Michael “Doc” Norton presentation Take Control of Your Development Career http://docondev.blogspot.com/ That should be the first thing any developer should look and follow like it was a pattern. I would personally recommend to find some language or pattern you are interested with and learn it, learn something that will make you happy. Second, join a User Group and get involve in the community. There are hundreds of user groups, and I’m sure you’ll find one in your city or near you town. Code Camps are Developers Meet Ups are also good resources. Third, I would join a open source project you are interested or better yet, create a new open source project with the new technology that you have learn and get coding. Fourth, create a Twitter account and follow the people that talks about the technology you are interested on. If you follow this 4 steps above I think you’ll be on your way, after they are complete, when you release your Open Source project you can say that you accomplished the first steps. Now, do not expect anything to change in your career life, you are changing and should not expect anything in return, besides borrowing some time from sleeping and your family. Creating a good schedule may help you, I find wasted time in many places that I use. Flying for work is actually one of those that allows me to do my best work on a airplane, don’t need to borrow time from anywhere else. Making sure you always have a light, charged laptop is so important. Next steps following the Michael “Doc” Norton Pattern or my interpretation of. First, help run a user group or better yet, start a new user group. I’ll add, as well, go to one conference a year and free development events around your city; Code Camps, Geek Dinners, etc. There are many free events sponsored by different companies for developers to get to know their products, I highly recommend those as the way to get connected. Second, chose a mentor, this is a very hard thing to do I experienced, find an expert in the technology you are learning that has the time for you, it is difficult, I wish you best of luck. Third, learn another technology or pattern, open your horizons a little bit more. Why not, if you had fun previously, keep doing it. Fourth, get involved in forums to answer and ask questions, getting notice in public forums is rewarding for your ego after such a long journey. Final steps following the Michael “Doc” Norton Pattern Teach what you know, become humble on your knowledge, find as many opportunities to teach and to get involved with the community, bring all that to your day job. Mr. Norton talks about getting naked, expose yourself to others in your knowledge and what you do not know. You are never too important for small opportunities, yet don’t  be afraid to take anything big and learn from the experience. Anytime you have the opportunity to talk to somebody that has reach the point the community knows his or her name, means that you should learn from it. Take opportunities that won’t make you money, yet will make you happy. Sometimes you need to spend money and time. Register talks in Code Camps and Dev Meet Ups, those are free, also go to Conference, Development Summits and Geek Diners for example. One day, people will pay you to attend. When will all these pay off? I don’t know. I’m still in the path, there are a few things that during your journey you may get little acknowledgements that you are in the correct path. In my case I think those are the little signs that tells you about your journey. I got awarded the Microsoft Most Valuable Professional for ASP.NET in 2007, 2008, 2009 and 2010. I got selected to speak at the DevConnections in Las Vegas in 2010 and Orlando 2011. I do believe that I do have a long way to go, yet what I do makes me happy and I hope I can keep doing for years to come. Every year I can see an improvement on my code, and more frameworks and languages are under my belt, I learn to embrace them all as well as in my daily job, I have been able to work in a few projects beyond my department. I’m a learner and believer of the Michael “Doc” Norton pattern. Looking forward to learn more about it to be able to apply it better. In my short journey I now see my mistakes, I did a few things right, I have been listening the intelligent people and not being afraid to move along the technology changes. In my professional life, I have tried to avoid being placed in only one technology and product. I have always share my code and never confused anybody that wanted to take over any of my projects, I didn’t think anything I created as my own nor care too much when politics didn’t see my vision. I stayed flexible, ready and visible, yet humble. I keep my head just below the clouds, and avoided managers meetings. I credit my manager for my success, and I faulted publicly only myself for the failures. Hope this helps. Cheers, Al Follow me in Twitter  Read my previous post tweetmeme_url = 'http://weblogs.asp.net/albertpascual/archive/2010/12/09/part-2-career-development-as-a-software-developer-without-becoming-a-manager.aspx'; tweetmeme_source = 'alpascual';

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  • Dell Dimension 2350 with a Pentium IV processor and integrated video and network chips running Fedor

    - by Jim Dobbs
    Dell Dimension 2350 with a Pentium IV processor and integrated video and network chips running Fedora12 does a "Sleeping Beauty" and I, apparently, am not am not a "handsome prince"! The system puts video and network to sleep and it will not wakeup. I have heard of this problem on laptops, but this is a tower. Any ideas or help is appreciated. I tried to ping the network card from another system and ping fails. The logs indicate that the system continues to be active. Pressing keyboard short-cut keys makes the disk light blink but neither the video or network card comes alive. Failing all else, are there any Linux commands that I could schedule in cron to pulse video and network adapters hourly that will keep them awake? Or, should I wait on Fedora13? Before this machine, I built a Dimension 2400 with Pentium IV and it had the same problem. Fedora9 on the same hardware is fine.

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  • How does the receiver of a cipher text know the IV used for encryption?

    - by PatrickL
    If a random IV is used in encrypting plain text, how does the receiver of the cipher text know what the IV is in order to decrypt it? This is a follow-up question to a response to the previous stackoverflow question on IVs here. The IV allows for plaintext to be encrypted such that the encrypted text is harder to decrypt for an attacker. Each bit of IV you use will double the possibilities of encrypted text from a given plain text. The point is that the attacker doesn't know what the IV is and therefore must compute every possible IV for a given plain text to find the matching cipher text. In this way, the IV acts like a password salt. Most commonly, an IV is used with a chaining cipher (either a stream or block cipher). ... So, if you have a random IV used to encrypt the plain text, how do you decrypt it? Simple. Pass the IV (in plain text) along with your encrypted text. Wait. You just said the IV is randomly generated. Then why pass it as plain text along with the encrypted text?

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  • How to find Key and IV value from .Net to PHP

    - by PHP-Prabhu
    Can any one please let me know is there any way to find a solution for the below stuffs. I need to find out the KEY and IV value from the below byte array. the byte array in .net and this has to be convert into KEY(string) and IV(string) via PHP. private static readonly byte[] Key = { 0xda, 0x3c, 0x35, 0x6f, 0xbd, 0xd, 0x87, 0xf0, 0x9a, 0x7, 0x6d, 0xab, 0x7e, 0x82, 0x36, 0xa, 0x1a, 0x5a, 0x77, 0xfe, 0x74, 0xf3, 0x7f, 0xa8, 0xaa, 0x4, 0x11, 0x46, 0x6b, 0x2d, 0x48, 0xa1 }; private static readonly byte[] IV = { 0x6d, 0x2d, 0xf5, 0x34, 0xc7, 0x60, 0xc5, 0x33, 0xe2, 0xa3, 0xd7, 0xc3, 0xf3, 0x39, 0xf2, 0x16 };

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  • RijndaelManaged: IV Generation?

    - by cam
    I want to implement the most secure, and most reliable form of symmetric key cryptography in my application. The user should input a password to encrypt/decrypt, and that's all. For RijndaelManaged, one must enter a key and an IV. I'm not sure how to address the situation. Right now, I have the entered password being hashed by SHA256 and then being used as the key for the Rijndael. What do I use for the IV? Another password?

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  • Silverlight and Encryption, how to store/generate they key/iv pair?

    - by cmaduro
    I have a Silverlight app that connects to a php webservice. I want to encrypt the communication between the webservice and the Silverlight client. I'm not relying on SSL. I'm encrypting/decrypting the POST string myself using AES 256bit Key and IV. The big questions then are: How do I generate a random unique key/iv pair in PHP. How do I share this key/iv pair between the web service and silverlight client in a secure way. It seems impossible without having some kind of hard coded key or iv on the client. Which would compromise security. This is a public website, there are no logins. Just the requirement of secure communication. I can hard code the seed for the key/iv (which is hashed with SHA256 with a time stamp salt and then assigned as the key or iv) in PHP source code, that's on the server so that is pretty safe. However on the client the seed for the key/iv pair would be visible, if it is hard coded. Further more using a time stamp as the basis for uniqueness/randomness is definitely not ok, since timestamps are predictable. It does however provide a common factor between the C# code and the PHP code. The only other option that I can think of would be to have a 3rd service involved that provides the key/iv to the Silverlight client, as well as the php webservice. This of course start the cycle anew, with the question of how to store the credentials for accessing the key/iv distribution service on the Silverlight client. Sounds like the solution is then asymmetric encryption, since sensitive data will be viewed only on the administrative back end of the website. Unfortunately Silverlight has no asymmetric encryption classes. The solution? Roll my own Diffie-Hellman key exchange! Plug that key into AES256!

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  • I need an answer book of Michael Mannino [closed]

    - by matin1234
    Hi I want to do all problems of database development application and design book of Michael Mannino but really I don't know the correct answer of them .I have searched a lot for downloading the answer book but I couldn't find it ,please help me that how can I find it or is there any other book with this subject that has answer for its problem.(I need a link) thanks

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  • Why is using a Non-Random IV with CBC Mode a vulnerability?

    - by The Rook
    I understand the purpose of an IV. Specifically in CBC mode this insures that the first block of of 2 messages encrypted with the same key will never be identical. But why is it a vulnerability if the IV's are sequential? According to CWE-329 NON-Random IV's allow for the possibility of a dictionary attack. I know that in practice protocols like WEP make no effort to hide the IV. If the attacker has the IV and a cipher text message then this opens the door for a dictionary attack against the key. I don't see how a random iv changes this. (I know the attacks against wep are more complex than this.) What security advantage does a randomized iv have? Is this still a problem with an "Ideal Block Cipher"? (A perfectly secure block cipher with no possible weaknesses.)

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  • Search Engine Marketing Ardan Michael Blum, Would You Like to Learn SEO Like a Pro?

    Learning Search Engine Optimization techniques (SEO) along with keyword research is key to marketing yourself, your business, your website or your blog on the internet. Ardan Michael Blum is a Yahoo SEO expert out of Switzerland. He has over 9 years experience as a SEO expert and guarantees his clients first page rankings in the search engines. For a business, first page rankings can mean success! But, outsourcing to someone like Ardan Michael Blum is going to be costly.

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  • Michael Hartl's rails tutorial: reusing sessions resource for multiple User types

    - by ntaj
    I'm learning Ruby on Rails through Micheal Hartl's tutorial. In my web application, I require two types of Users, called publishers and subscribers. Currently I have a publishers resource and a subscribers resource. I'd like both of them to be able to use the sessions resource for signin/signout. I'm looking for some direction on how to implement this. Should my publisher and subscriber resource inherit from the User resource, so that, for example, the following code works through polymorphism? def create user = User.find_by_email(params[:session][:email]) if user && user.authenticate(params[:session][:password]) # Sign the user in and redirect to the user's show page. else # Create an error message and re-render the signin form. end end The publisher and subscriber do not have many common fields and different capabilities, so I think they should be modeled as two separate resources, but how to have them share the Sessions resource?

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  • Why does Mac OS X ignore my Windows NTFS and Share permissions?

    - by Michael
    Mac OS X Snow Leopard Windows Server 2003 Windows Folder "Videos" Share Permissions on Videos - Everyone NTFS Permissions on Videos - System (Full Control) - Domain Users (Modify) - Domain Admins (Full Control) Mac user Michael is a part of the Domain Users group. He connects to Videos using cifs://server/Videos and authenticates with his username Michael. Michael copies over a file "dance dance baby.avi". User Jon opens the Videos folder but cannot see the dance dance baby.avi file. Checking the dance dance baby.avi file permissions here is what I see: Everyone - Read, Write Domain Admins - Full Control Michael - Read, Write Owner of File - Michael So here's my question, how come when Michael copies a file over from a Mac, the permissions on the file get changed even though Michael has no rights to change permissions? If the same file is copied over from a Windows machine, it just inherits the proper permissions from the parent Video folder. Am I missing something? Are my permissions wrong? Thanks. Michael

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  • How do you save and retrieve a Key/IV pair securely?

    - by Shawn Steward
    I'm using VB.Net's RijndaelManaged (RM) to encrypt files, using the RM.GenerateKey and RM.GenerateIV methods to generate the Key and IV and encrypting the file using the CryptoStream class. I'm planning on saving this Key and IV to a file and want to make sure I'm doing it the right way. I am combining the IV+Key, and encrypting that with my RSA Public key and writing it out to a file. Then, to decrypt I use the RSA Private key on this file to get the IV+Key, split them up and set RM.Key and RM.IV to these values and run the decryptor. Is this the best method to accomplish this, or is there a preferred method for saving the IV & Key? Also, what's the best way to construct and deconstruct the byte array? I used the .Concat method to join them together and that seems to work well but I can't seem to find something as easy to deconstruct it. I played with the .Take method that takes the first x # of bytes and it works for the first part but can't find anything that gets the rest of it.

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  • Why can't we just use a hash of passphrase as the encryption key (and IV) with symmetric encryption algorithms?

    - by TX_
    Inspired by my previous question, now I have a very interesting idea: Do you really ever need to use Rfc2898DeriveBytes or similar classes to "securely derive" the encryption key and initialization vector from the passphrase string, or will just a simple hash of that string work equally well as a key/IV, when encrypting the data with symmetric algorithm (e.g. AES, DES, etc.)? I see tons of AES encryption code snippets, where Rfc2898DeriveBytes class is used to derive the encryption key and initialization vector (IV) from the password string. It is assumed that one should use a random salt and a shitload of iterations to derive secure enough key/IV for the encryption. While deriving bytes from password string using this method is quite useful in some scenarios, I think that's not applicable when encrypting data with symmetric algorithms! Here is why: using salt makes sense when there is a possibility to build precalculated rainbow tables, and when attacker gets his hands on hash he looks up the original password as a result. But... with symmetric data encryption, I think this is not required, as the hash of password string, or the encryption key, is never stored anywhere. So, if we just get the SHA1 hash of password, and use it as the encryption key/IV, isn't that going to be equally secure? What is the purpose of using Rfc2898DeriveBytes class to generate key/IV from password string (which is a very very performance-intensive operation), when we could just use a SHA1 (or any other) hash of that password? Hash would result in random bit distribution in a key (as opposed to using string bytes directly). And attacker would have to brute-force the whole range of key (e.g. if key length is 256bit he would have to try 2^256 combinations) anyway. So either I'm wrong in a dangerous way, or all those samples of AES encryption (including many upvoted answers here at SO), etc. that use Rfc2898DeriveBytes method to generate encryption key and IV are just wrong.

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  • OS X not allowing me to rename a folder

    - by YGA
    Hi Folks, Can anyone thing of a reason why OS X would not allow me to do this? I seem to have total permissions... new-host-4:Desktop michael$ whoami michael new-host-4:Desktop michael$ ls -ltdr 2008_12_12/ drwxrwxrwx+ 5 michael wheel 170 Mar 28 18:23 2008_12_12/ new-host-4:Desktop michael$ mv 2008_12_12/ foo mv: rename 2008_12_12/ to foo: Permission denied new-host-4:Desktop michael$ Thanks! /YGA

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  • encfs error while decoding the data

    - by migrator
    I have installed encfs and started using it to secure all my personal & office data and it was working absolutely fine until 2 hours back. The setup is like this. I have a folder in Copy folder called OfficeData which gets synchronized with my Copy folder When I login into the system I use the command encfs ~/Copy/OfficeData ~/Documents/OfficeData Once my work is over I dismount with the command fusermount -u ~/Documents/OfficeData All this data get synchronized with my desktop and with my mobile phone (as a backup) Today when I mounted, the folder got mounted by no directories and files present in that folder. I was worried and read man encfs which gave me to run the command encfs -v -f ~/Copy/OfficeData ~/Documents/OfficeData 2> encfs-OfficeData-report.txt. The below is the output of the file encfs-OfficeData-report.txt. The directory "/home/sri/Documents/OfficeData" does not exist. Should it be created? (y,n) 13:16:26 (main.cpp:523) Root directory: /home/sri/Copy/OfficeData/ 13:16:26 (main.cpp:524) Fuse arguments: (fg) (threaded) (keyCheck) encfs /home/sri/Documents/OfficeData -f -s -o use_ino -o default_permissions 13:16:26 (FileUtils.cpp:177) version = 20 13:16:26 (FileUtils.cpp:181) found new serialization format 13:16:26 (FileUtils.cpp:199) subVersion = 20100713 13:16:26 (Interface.cpp:165) checking if ssl/aes(3:0:2) implements ssl/aes(3:0:0) 13:16:26 (SSL_Cipher.cpp:370) allocated cipher ssl/aes, keySize 32, ivlength 16 13:16:26 (Interface.cpp:165) checking if ssl/aes(3:0:2) implements ssl/aes(3:0:0) 13:16:26 (SSL_Cipher.cpp:370) allocated cipher ssl/aes, keySize 32, ivlength 16 13:16:26 (FileUtils.cpp:1620) useStdin: 0 13:16:46 (Interface.cpp:165) checking if ssl/aes(3:0:2) implements ssl/aes(3:0:0) 13:16:46 (SSL_Cipher.cpp:370) allocated cipher ssl/aes, keySize 32, ivlength 16 13:16:49 (FileUtils.cpp:1628) cipher key size = 52 13:16:49 (Interface.cpp:165) checking if nameio/block(3:0:1) implements nameio/block(3:0:0) 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn: No such file or directory 13:16:49 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 4188221457101129840, fileIV = 0 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn: No such file or directory 13:16:49 (encfs.cpp:138) getattr error: No such file or directory 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF: No such file or directory 13:16:49 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 16725694203599486310, fileIV = 0 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF: No such file or directory 13:16:49 (encfs.cpp:138) getattr error: No such file or directory 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/tVglci2rgp9o8qE-m9AvX6JNj1lQs-ER0OvnxfOb30Z,3,: No such file or directory 13:16:49 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 1354483141023495884, fileIV = 0 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/tVglci2rgp9o8qE-m9AvX6JNj1lQs-ER0OvnxfOb30Z,3, 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/tVglci2rgp9o8qE-m9AvX6JNj1lQs-ER0OvnxfOb30Z,3, 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/tVglci2rgp9o8qE-m9AvX6JNj1lQs-ER0OvnxfOb30Z,3,: No such file or directory 13:16:49 (encfs.cpp:138) getattr error: No such file or directory 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn: No such file or directory 13:16:49 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 16720606331386655431, fileIV = 0 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn: No such file or directory 13:16:49 (encfs.cpp:138) getattr error: No such file or directory 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:16:49 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:16:49 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:16:49 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:16:49 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:16:49 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:16:49 (FileNode.cpp:127) calling setIV on (null) 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn: No such file or directory 13:16:49 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 16720606331386655431, fileIV = 0 13:16:49 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn 13:16:49 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn 13:16:49 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/r1KIEqVkz-,7-6CobavHCSNn: No such file or directory 13:16:49 (encfs.cpp:138) getattr error: No such file or directory 13:19:31 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:19:31 (FileNode.cpp:127) calling setIV on (null) 13:19:31 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/ 13:19:31 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/ 13:19:31 (encfs.cpp:685) doing statfs of /home/sri/Copy/OfficeData 13:19:32 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:19:32 (FileNode.cpp:127) calling setIV on (null) 13:19:32 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/LuT8R,DlpRnNH9b,fjWiKHKc: No such file or directory 13:19:32 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 13735228085838055696, fileIV = 0 13:19:32 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/LuT8R,DlpRnNH9b,fjWiKHKc 13:19:32 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/LuT8R,DlpRnNH9b,fjWiKHKc 13:19:32 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/LuT8R,DlpRnNH9b,fjWiKHKc: No such file or directory 13:19:32 (encfs.cpp:138) getattr error: No such file or directory 13:19:32 (encfs.cpp:685) doing statfs of /home/sri/Copy/OfficeData 13:19:32 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:19:32 (FileNode.cpp:127) calling setIV on (null) 13:19:32 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn: No such file or directory 13:19:32 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 4188221457101129840, fileIV = 0 13:19:32 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn 13:19:32 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn 13:19:32 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/UWbT-M-UKk1JpvNfN5uvOhGn: No such file or directory 13:19:32 (encfs.cpp:138) getattr error: No such file or directory 13:19:32 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0 13:19:32 (FileNode.cpp:127) calling setIV on (null) 13:19:32 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF: No such file or directory 13:19:32 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 16725694203599486310, fileIV = 0 13:19:32 (DirNode.cpp:770) created FileNode for /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF 13:19:32 (encfs.cpp:134) getattr /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF 13:19:32 (RawFileIO.cpp:191) getAttr error on /home/sri/Copy/OfficeData/o94olxB3orqarqyFviHKZ,ZF: No such file or directory 13:19:32 (encfs.cpp:138) getattr error: No such file or directory 13:19:32 (encfs.cpp:213) getdir on /home/sri/Copy/OfficeData/ 13:19:32 (BlockNameIO.cpp:185) padding, _bx, finalSize = 208, 16, -192 13:19:32 (DirNode.cpp:132) error decoding filename: eWJrLh2dRFAY-7Brbsc,mTqf 13:19:32 (DirNode.cpp:132) error decoding filename: .encfs6.xml 13:19:32 (BlockNameIO.cpp:185) padding, _bx, finalSize = 218, 16, -202 13:19:32 (DirNode.cpp:132) error decoding filename: pvph9DkZ0BMPg2vN4UcfwuNU 13:24:10 (openssl.cpp:48) Allocating 41 locks for OpenSSL Please help me Thanks in advance.

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  • Michael Crump&rsquo;s notes for 70-563 PRO &ndash; Designing and Developing Windows Applications usi

    - by mbcrump
    TIME TO GO PRO! This is my notes for 70-563 PRO – Designing and Developing Windows Applications using .NET Framework 3.5 I created it using several resources (various certification web sites, msdn, official ms 70-548 book). The reason that I created this review is because a) I am taking the exam. b) MS did not create a book for this exam. Use the(MS 70-548)book. c) To make sure I am familiar with each before the exam. I hope that it provides a good start for your own notes. I hope that someone finds this useful. At least, it will give you a starting point of what to expect to know on the PRO exam. Also, for those wondering, the PRO exam does contains very little code. It is basically all theory. 1. Validation Controls – How to prevent users from entering invalid data on forms. (MaskedTextBox control and RegEx) 2. ServiceController – used to start and control the behavior of existing services. 3. User Feedback (know winforms Status Bar, Tool Tips, Color, Error Provider, Context-Sensitive and Accessibility) 4. Specific (derived) exceptions must be handled before general (base class) exceptions. By moving the exception handling for the base type Exception to after exception handling of ArgumentNullException, all ArgumentNullException thrown by the Helper method will be caught and logged correctly. 5. A heartbeat method is a method exposed by a Web service that allows external applications to check on the status of the service. 6. New users must master key tasks quickly. Giving these tasks context and appropriate detail will help. However, advanced users will demand quicker paths. Shortcuts, accelerators, or toolbar buttons will speed things along for the advanced user. 7. MSBuild uses project files to instruct the build engine what to build and how to build it. MSBuild project files are XML files that adhere to the MSBuild XML schema. The MSBuild project files contain complete file, build action, and dependency information for each individual projects. 8. Evaluating whether or not to fix a bug involves a triage process. You must identify the bug's impact, set the priority, categorize it, and assign a developer. Many times the person doing the triage work will assign the bug to a developer for further investigation. In fact, the workflow for the bug work item inside of Team System supports this step. Developers are often asked to assess the impact of a given bug. This assessment helps the person doing the triage make a decision on how to proceed. When assessing the impact of a bug, you should consider time and resources to fix it, bug risk, and impacts of the bug. 9. In large projects it is generally impossible and unfeasible to fix all bugs because of the impact on schedule and budget. 10. Code reviews should be conducted by a technical lead or a technical peer. 11. Testing Applications 12. WCF Services – application state 13. SQL Server 2005 / 2008 Express Edition – reliable storage of data / Microsoft SQL Server 3.5 Compact Database– used for client computers to retrieve and save data from a shared location. 14. SQL Server 2008 Compact Edition – used for minimum possible memory and can synchronize data with a corporate SQL Server 2008 Database. Supports offline user and minimum dependency on external components. 15. MDI and SDI Forms (specifically IsMDIContainer) 16. GUID – in the case of data warehousing, it is important to define unique keys. 17. Encrypting / Security Data 18. Understanding of Isolated Storage/Proper location to store items 19. LINQ to SQL 20. Multithreaded access 21. ADO.NET Entity Framework model 22. Marshal.ReleaseComObject 23. Common User Interface Layout (ComboBox, ListBox, Listview, MaskedTextBox, TextBox, RichTextBox, SplitContainer, TableLayoutPanel, TabControl) 24. DataSets Class - http://msdn.microsoft.com/en-us/library/system.data.dataset%28VS.71%29.aspx 25. SQL Server 2008 Reporting Services (SSRS) 26. SystemIcons.Shield (Vista UAC) 27. Leverging stored procedures to perform data manipulation for a database schema that can change. 28. DataContext 29. Microsoft Windows Installer Packages, ClickOnce(bootstrapping features), XCopy. 30. Client Application Services – will authenticate users by using the same data source as a ASP.NET web application. 31. SQL Server 2008 Caching 32. StringBuilder 33. Accessibility Guidelines for Windows Applications http://msdn.microsoft.com/en-us/library/ms228004.aspx 34. Logging erros 35. Testing performance related issues. 36. Role Based Security, GenericIdentity and GenericPrincipal 37. System.Net.CookieContainer will store session data for webapps (see isolated storage for winforms) 38. .NET CLR Profiler tool will identify objects that cause performance issues. 39. ADO.NET Synchronization (SyncGroup) 40. Globalization - CultureInfo 41. IDisposable Interface- reports on several questions relating to this. 42. Adding timestamps to determine whether data has changed or not. 43. Converting applications to .NET Framework 3.5 44. MicrosoftReportViewer 45. Composite Controls 46. Windows Vista KNOWN folders. 47. Microsoft Sync Framework 48. TypeConverter -Provides a unified way of converting types of values to other types, as well as for accessing standard values and sub properties. http://msdn.microsoft.com/en-us/library/system.componentmodel.typeconverter.aspx 49. Concurrency control mechanisms The main categories of concurrency control mechanisms are: Optimistic - Delay the checking of whether a transaction meets the isolation rules (e.g., serializability and recoverability) until its end, without blocking any of its (read, write) operations, and then abort a transaction, if the desired rules are violated. Pessimistic - Block operations of a transaction, if they may cause violation of the rules. Semi-optimistic - Block operations in some situations, and do not block in other situations, while delaying rules checking to transaction's end, as done with optimistic. 50. AutoResetEvent 51. Microsoft Messaging Queue (MSMQ) 4.0 52. Bulk imports 53. KeyDown event of controls 54. WPF UI components 55. UI process layer 56. GAC (installing, removing and queuing) 57. Use a local database cache to reduce the network bandwidth used by applications. 58. Sound can easily be annoying and distracting to users, so use it judiciously. Always give users the option to turn sound off. Because a user might have sound off, never convey important information through sound alone.

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