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• Generate reasonable length license key with asymmetric encryption?

  - by starkos

  I've been looking at this all day. I probably should have walked away from it hours ago; I might be missing something obvious at this point. Short version: Is there a way to generate and boil down an asymmetrically encrypted hash to a reasonable number of unambiguous, human readable characters? Long version: I want to generate license keys for my software. I would like these keys to be of a reasonable length (25-36 characters) and easily read and entered by a human (so avoid ambiguous characters like the number 0 and the capital letter O). Finally--and this seems to be the kicker--I'd really like to use asymmetric encryption to make it more difficult to generate new keys. I've got the general approach: concatenate my information (user name, product version, a salt) into a string and generate a SHA1() hash from that, then encrypt the hash with my private key. On the client, build the SHA1() hash from the same information, then decrypt the license with the public key and see if I've got a match. Since this is a Mac app, I looked at AquaticPrime, but that generates a relatively large license file rather than a string. I can work with that if I must, but as a user I really like the convenience of a license key that I can read and print. I also looked at CocoaFob which does generate a key, but it is so long that I'd want to deliver it as a file anyway. I fooled around with OpenSSL for a while but couldn't come up with anything of a reasonable length. So...am I missing something obvious here? Is there a way to generate and boil down an asymmetrically encrypted hash to a reasonable number of unambiguous, human readable characters? I'm open to buying a solution. But I work on a number of different of platforms, so I'd want something portable. Everything I've looked at so far has been platform specific. Many, many thanks for a solution! PS - Yes, I know it will still be cracked. I'm trying to come up with something reasonable that, as a user, I would still find friendly.

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• How to safely store encryption key in a .NET assembly

  - by Alex

  In order to prevent somebody from grabbing my data easily, I cache data from my service as encrypted files (copy protection, basically). However, in order to do this, I must store the encryption key within the .NET assembly so it is able to encrypt and decrypt these files. Being aware of tools like Red Gate's .NET Reflector which can pull my key right out, I get a feeling that this is not a very safe way of doing it... are there any best practices to doing this?

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• Improving performance of cluster index GUID primary key

  - by TheVillageIdiot

  Hi, I've a table with large number of rows (10K+) and it primary key is GUID. The primary key is clustered. The query performance is quite low on this table. Please provide suggestions to make it efficient.

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• I need to auto_increment a field in MySQL that is not primary key

  - by behrk2

  Hey everyone, Right now, I have a table whose primary key is an auto_increment field. However, I need to set the primary key as username, date (to ensure that there cannot be a duplicate username with a date). I need the auto_increment field, however, in order to make changes to row information (adding and deleting). What is normally done with this situation? Thanks!

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• Key Value Database For Windows?

  - by Axl

  Other than MongoDB and Memcached, what key-value stores run on Windows? Most of the ones I've seen seem to only run on Linux (Hypertable, Redis, Lightcloud). Related links: http://stackoverflow.com/questions/639545/is-there-a-business-proven-cloud-store-keyvalue-database-open-source http://www.metabrew.com/article/anti-rdbms-a-list-of-distributed-key-value-stores/

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• Android: Text primary key with different name

  - by Echilon

  I have an existing Windows app for which I'm writing an Android port. The app uses a unique string as the primary key, but the SQLite methods in Android all seem to work with integers and a column names _id, whereas my ID column isn't called this. Is there a way to let Android know I have a key with a different column name?

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• jquery event handler- trigger function upon specific key and action

  - by Gal

  Background story: when a user selects a portion of text in a text field with her mouse (mark it up manually), and subsequently hits "alt" key, a certain function would trigger. My questions are: How can I trigger a function when a user hits a key (in her keyboard)? How can I preserve a portion of text selected, and use it as a parameter for that function? I've tried looking up online but haven't found any good answers, but i'd greatly appreciate links as well.

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• When i should use primary key or index?

  - by Sein Kraft

  When i should use primary key or index? Which are the differences between primary key and index and which is the best?

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• PHP - Find parent key of array

  - by Jordan Rynard

  I'm trying to find a way to return the value of an array's parent key. For example, from the array below I'd like to find out the parent's key where $array['id'] == "0002". The parent key is obvious because it's defined here (it would be 'products'), but normally it'd be dynamic, hence the problem. The 'id' and value of 'id' is known though. [0] => Array ( [data] => [id] => 0000 [name] => Swirl [categories] => Array ( [0] => Array ( [id] => 0001 [name] => Whirl [products] => Array ( [0] => Array ( [id] => 0002 [filename] => 1.jpg ) [1] => Array ( [id] => 0003 [filename] => 2.jpg ) ) ) ) )

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• .NET - getting form field key/value pairs?

  - by AverageJoe719

  Hi there, I've got a form with textboxes and I want to run some server side validation code on the values after the form is submitted. I was planning to grab all the textbox controls on the page and adding them to a list, then running a for each loop that says for each control in the list query the database where fieldValidation.Name = Control.Name. This would return to me an object and an associated function where i coudl then input the Control.Value and actually perform the validation. My friend told me building the list is not necessary because all languages have a way to get key/value pairs from forms (he doesn't know .NET so coudln't help me). I may be searching the wrong term here but I have not been able to find a result, or maybe I misunderstood my friend. Is there some kind of dictionary or key/value pair automatically generated upon form submissions that contains the value that was submitted and...I guess also the control? Or am I just misunderstanding him. If he was just saying populate a key/value pair based on the form submissions, how does that help me in this situation over a list that contains the control? Thanks =)

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• need primitive public key signature with out of band key distribution

  - by Mike D

  I pretty much a complete neophyte at this signature business so I don't know if what I'm asking is nonsense or not. Anyway, here goes... I want to send an out of band message (don't worry about how it gets there) to a program I've written on a distant machine. I want the program to have some confidence the message is legit by attaching a digital signature to the message. The message will be small less than 200 characters. It seems a public key based signature is what I want to use. I could embed the public key in the program. I understand that the program would be vulnerable to attack by anyone who modifies it BUT I'm not too worried about that. The consequences are not dire. I've looked through the MSDN and around the web but the prospect of diving in is daunting. I'm writing in straight c++, no NET framework or other fancy stuff. I've had no experience including NET framework stuff and little luck during previous attempts. Can anyone point me at some very basic resources to get me started? I need to know 1)how to generate the public and private keys 2)how to sign the message 3)how to verify the signature Any help much appreciated. TIA, Mike

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• OpenSSL certificate lacks key identifiers

  - by 0xDEAD BEEF

  How do i add these sections to certificate (i am manualy building it using C++). X509v3 Subject Key Identifier: A4:F7:38:55:8D:35:1E:1D:4D:66:55:54:A5:BE:80:25:4A:F0:68:D0 X509v3 Authority Key Identifier: keyid:A4:F7:38:55:8D:35:1E:1D:4D:66:55:54:A5:BE:80:25:4A:F0:68:D0 Curently my code builds sertificate well, except for those keys.. :/ static X509 * GenerateSigningCertificate(EVP_PKEY* pKey) { X509 *x; x = X509_new(); //create x509 certificate X509_set_version(x, NID_X509); ASN1_INTEGER_set(X509_get_serialNumber(x), 0x00000000); //set serial number X509_gmtime_adj(X509_get_notBefore(x), 0); X509_gmtime_adj(X509_get_notAfter(x),(long)60*60*24*365); //1 year X509_set_pubkey(x, pKey); //set pub key from just generated rsa X509_NAME *name; name = X509_get_subject_name(x); NAME_StringField(name, "C", "LV"); NAME_StringField(name, "CN", "Point"); //common name NAME_StringField(name, "O", "Point"); //organization X509_set_subject_name(x, name); //save name fields to certificate X509_set_issuer_name(x, name); //save name fields to certificate X509_EXTENSION *ex; ex = X509V3_EXT_conf_nid(NULL, NULL, NID_netscape_cert_type, "server"); X509_add_ext(x,ex,-1); X509_EXTENSION_free(ex); ex = X509V3_EXT_conf_nid(NULL, NULL, NID_netscape_comment, "example comment extension"); X509_add_ext(x, ex, -1); X509_EXTENSION_free(ex); ex = X509V3_EXT_conf_nid(NULL, NULL, NID_netscape_ssl_server_name, "www.lol.lv"); X509_add_ext(x, ex, -1); X509_EXTENSION_free(ex); ex = X509V3_EXT_conf_nid(NULL, NULL, NID_basic_constraints, "critical,CA:TRUE"); X509_add_ext(x, ex, -1); X509_EXTENSION_free(ex); X509_sign(x, pKey, EVP_sha1()); //sign x509 certificate return x; }

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• wanted to extend jQuery to handle a custom enter key event based on tabindex

  - by ullasvk

  I write the following code to handle when the enter key pressed an with few validation like if it is a textarea allow only four lines and if the value is empty, focus on itself. var temp = 1; function getLines(id) { return temp=temp+id; } $("#theform").keypress(function(e){ var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0; if (key == 13) { var $targ = $(e.target); var tindex = $targ.attr("tabindex"); var count =1; var focusNext = false; var allowedNumberOfLines = 4; if ($targ.is("textarea") && !$targ.is(":button,:submit")) { var lines= getLines(count); if (lines > allowedNumberOfLines) { $("#login_error").css('background', '#F7F77C').fadeIn(1000).html("Only "+allowedNumberOfLines+" Lines Allowed").fadeOut(1000); tindex++; $("[tabindex=" + tindex + "]").focus(); return false; } } else if($targ.val() =='' || $targ.val() == "undefined") { $("[tabindex=" + tindex + "]").focus(); return false; } else if($targ.val() !='' || $targ.val() != "undefined") { tindex++; $("[tabindex=" + tindex + "]").focus(); return false; } } }); Is there any way to make it a custom function so that i can just call the function like $('theform').returnPress();

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• Rationale in selecting Hash Key type

  - by Amrish

  Guys, I have a data structure which has 25 distinct keys (integer) and a value. I have a list of these objects (say 50000) and I intend to use a hash table to store/retrieve them. I am planning to take one of these approaches. Create a integer hash from these 25 integer keys and store it on a hash table. (Yeah! I have some means to handle collisions) Make a string concatenation on the individual keys and use it as a hash key for the hash table. For example, if the key values are 1,2,4,6,7 then the hash key would be "12467". Assuming that I have a total of 50000 records each with 25 distinct keys and a value, then will my second approach be a overkill when it comes to the cost of string comparisons it needs to do to retrieve and insert a record? Some more information! Each bucket in the hash table is a balanced binary tree. I am using the boost library's hash_combine method to create the hash from the 25 keys.

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• MySQL: optimization of table (indexing, foreign key) with no primary keys

  - by Haradzieniec

  Each member has 0 or more orders. Each order contains at least 1 item. memberid - varchar, not integer - that's OK (please do not mention that's not very good, I can't change it). So, thera 3 tables: members, orders and order_items. Orders and order_items are below: CREATE TABLE `orders` ( `orderid` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT, `memberid` VARCHAR( 20 ), `Time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , `info` VARCHAR( 3200 ) NULL , PRIMARY KEY (orderid) , FOREIGN KEY (memberid) REFERENCES members(memberid) ) ENGINE = InnoDB; CREATE TABLE `order_items` ( `orderid` INT(11) UNSIGNED NOT NULL, `item_number_in_cart` tinyint(1) NOT NULL , --- 5 items in cart= 5 rows `price` DECIMAL (6,2) NOT NULL, FOREIGN KEY (orderid) REFERENCES orders(orderid) ) ENGINE = InnoDB; So, order_items table looks like: orderid - item_number_in_cart - price: ... 1000456 - 1 - 24.99 1000456 - 2 - 39.99 1000456 - 3 - 4.99 1000456 - 4 - 17.97 1000457 - 1 - 20.00 1000458 - 1 - 99.99 1000459 - 1 - 2.99 1000459 - 2 - 69.99 1000460 - 1 - 4.99 ... As you see, order_items table has no primary keys (and I think there is no sense to create an auto_increment id for this table, because once we want to extract data, we always extract it as WHERE orderid='1000456' order by item_number_in_card asc - the whole block, id woudn't be helpful in queries). Once data is inserted into order_items, it's not UPDATEd, just SELECTed. The questions are: I think it's a good idea to put index on item_number_in_cart. Could anybody please confirm that? Is there anything else I have to do with order_items to increase the performance, or that looks pretty good? I could miss something because I'm a newbie. Thank you in advance.

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• HTG Explains: How Private Browsing Works and Why It Doesn’t Offer Complete Privacy

  - by Chris Hoffman

  Private Browsing, InPrivate Browsing, Incognito Mode – it has a lot of names, but it’s the same basic feature in every browser. Private browsing offers some improved privacy, but it’s not a silver bullet that makes you completely anonymous online. Private Browsing mode changes the way your browser behaves, whether you’re using Mozilla Firefox, Google Chrome, Internet Explorer, Apple Safari, Opera or any other browser – but it doesn’t change the way anything else behaves. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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• Do private static methods in C# hurt anything?

  - by fish

  I created a private validation method for a certain validation that happens multiple times in my class (I can't store the validated data for various reasons). Now, ReSharper suggests that the function could be made static. I'm a little reluctant to do so due known problems with static methods. It would be a private static method. My question is, can private static methods cause similar coupling and testing problems like public static methods? Is it a bad practice? I would guess not, but I'm not sure if there is a pitfall here.

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• Can't connect to a remote server with Nautilus and a private key

  - by Desmond Hume

  The remote server requires a private key and passphrase for authentication. I tried putting username@server in the "Server" field and leaving "User name" and "Password" fields blank, putting the passphrase in the "Password" field, but it still says "Permission denied" and it doesn't ask for the private key at any point. I also tried ssh-add path/to/privatekey, but it says "Could not open a connection to your authentication agent.", however I'm not sure if ssh-add is even relevant. I can ssh into the server from the terminal just fine with the key/passphrase.

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• Chargeback and billing across public and private clouds

  - by llaszews

  Had a great conversation today regarding the need for metering, chargeback, and billing of cloud computing resources. The person I spoken with at a Fortune 1000 company increased the scope and magnitude of the issue of billing for cloud computing resources beyond what I had previously considered. I believed that doing any type of chargeback and billing for one public, private or hybrid installation was difficult. This person pointed out that the problem is even bigger in scope. The reality is many companies are using multiple public cloud vendors and have many different private cloud data centers. A customer may use AWS for some smaller public cloud applications, Salesforce.com (SaaS), Rackspace for IaaS, Savvis for colocation and a variety of Iaas and PaaS implementations for the private cloud. How does a company get a consolidated bill for all these different cloud environments? I am not sure their is an answer right now.

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• How to safely back up the "Private" folder?

  - by ImaginaryRobots

  I have an ecryptfs "Private" folder in my home directory, and it is set up to automatically mount whenever I log in. I want to set up automatic backups to a network drive, but I don't want the contents of Private to be readable on the remote server. My understanding is that the Ubuntu "Backup" utility would run while I'm logged in, so it would see the folder contents without encryption. I'm backing up from a laptop, so it is essentially only on when I am logged in. I know that the Private folder is essentially a mounted filesystem, so it seems like I should be able to backup the encrypted image rather than the cleartext contents. What steps are needed to safely back it up, while maintaining the encryption? Note that I'm already familiar with the backup tools available, this question is about dealing with the ecryptfs folder safely.

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• How public should a public key be allowed to become?

  - by Peter Coulton

  I have a script that I use to setup new slices on slicehost and one of the steps is to add my public key to the authorized_keys file. At the moment I scp a key manually, but ideally I would have the script download the key. So if my public key was very public what's the worst that could happen ? :)

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• how i can encrypt each file with its own public key ??

  - by Mohammad AL-Rawabdeh

  how i can encrypt each file with its own public key for example :- there exist 3 company (X,Y and Z)each company sent to me its own public key so that i have now 3 public key 1- x.pub 2- y.pub 3- z.pub now i want to send file to each company and encrypt it by its company public key 1- encrypt file1.txt by x.pub and send it to company X 2- encrypt file2.txt by y.pub and send it to company Y 3- encrypt file3.txt by z.pub and send it to company Z please how i can do the above by writting batch file my operating system is Windows

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• How can the route between two private IPs go via public IPs?

  - by Gilles

  I'm trying to understand what this output from traceroute means. I changed the IP addresses for privacy but retained the public/private IP range distinction. traceroute.db -e -n 10.1.1.9 traceroute to (10.1.1.9), 30 hops max, 60 byte packets 1 10.0.0.1 0.596 ms 0.588 ms 0.577 ms 2 10.0.0.2 1.032 ms 1.029 ms 1.084 ms 3 10.0.0.3 3.360 ms 3.355 ms 3.338 ms 4 23.0.0.4 3.974 ms 4.592 ms 4.584 ms 5 23.0.0.5 13.442 ms 13.445 ms 13.434 ms 6 45.0.0.6 13.195 ms 12.924 ms 12.913 ms 7 67.0.0.7 52.088 ms 51.683 ms 52.040 ms 8 10.1.1.8 46.878 ms 44.575 ms 44.815 ms 9 10.1.1.9 45.932 ms 45.603 ms 45.593 ms The first 10.0.* range is inside my organisation. The last 10.1.* range is another site of my organisation. The intermediate addresses belong to various ISPs. I expect that there is some kind of VPN between the two sites, but I don't know much about our network topology. What I don't understand is how the route can go from a private address through public addresses back into private addresses. Searching led me to Public IPs on MPLS Traceroute, which gives a possible explanation: MPLS. Is MPLS the only possible or most likely explanation? Otherwise what does this tell me about our network infrastructure? Bonus question for my edification: in this scenario, who is generating the ICMP TTL exceeded packets and if relevant mangling their source and destination addresses?

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• Zero to Cloud : One stop shop for resources to accelerate your transformation to enterprise private cloud

  - by Anand Akela

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} During the Oracle Open World 2012 last week, Oracle introduced "Zero to Cloud" resource center to help you accelerate your transformation journey to enterprise private cloud. To help organizations deploy fully operational, enterprise-grade private cloud environment in as little as half a day, Oracle has brought key content together into this single, user-friendly resource center. Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} The resource center is launched just as the Oracle Cloud Builder Summit series moves into full swing. Designed for executives, cloud architects, and IT operations professionals, the day-long event series will eventually reach nearly 100 cities around the globe. During this event, an interactive "Zero to Cloud" session will showcase the transformational journey of a fictitious enterprise to the private cloud using the latest solutions from Oracle—including, Oracle Database, Oracle Fusion Middleware, Oracle VM and Oracle Enterprise Manager, as well as Oracle’s full range of engineered systems. The online "Zero to Cloud" resource center includes best practices from Oracle experts and early adopter customers as well as interviews with Oracle development executives responsibly for Oracle’s private cloud solutions and roadmap. It also includes a new self-assessment quiz that can help determine readiness for a successful private cloud deployment. Once you've determined organizational readiness, explore early adopter tips, demos, guides, exclusive white papers and more at the "Zero to Cloud" resource center.

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• LINQ transform Dictionary<key,value> to Dictionary<value,key>

  - by code4life

  I'm having a low-brainwave day... Does anyone know of a quick & elegant way to transform a Dictionary so that the key becomes the value and vice-versa? Example: var originalDictionary = new Dictionary<int, string>() { {1, "One"}, {2, "Two"}, {3, "Three"} }; becomes var newDictionary = new Dictionary<string, int>(); // contents: // { // {"One". 1}, {"Two". 2}, {"Three", 3} // };

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