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  • Gathering entropy in web apps to create (more) secure random numbers

    - by H M
    after several days of research and discussion i came up with this method to gather entropy from visitors (u can see the history of my research here) when a user visits i run this code: $entropy=sha1(microtime().$pepper.$_SERVER['REMOTE_ADDR'].$_SERVER['REMOTE_PORT']. $_SERVER['HTTP_USER_AGENT'].serialize($_POST).serialize($_GET).serialize($_COOKIE)); note: pepper is a per site/setup random string set by hand. then i execute the following (My)SQL query: $query="update `crypto` set `value`=sha1(concat(`value`, '$entropy')) where name='entropy'"; that means we combine the entropy of the visitor's request with the others' gathered already. that's all. then when we want to generate random numbers we combine the gathered entropy with the output: $query="select `value` from `crypto` where `name`='entropy'"; //... extract(unpack('Nrandom', pack('H*', sha1(mt_rand(0, 0x7FFFFFFF).$entropy.microtime())))); note: the last line is a part of a modified version of the crypt_rand function of the phpseclib. please tell me your opinion about the scheme and other ideas/info regarding entropy gathering/random number generation. ps: i know about randomness sources like /dev/urandom. this system is just an auxiliary system or (when we don't have (access to) these sources) a fallback scheme.

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  • Remote desktop fails with user denied until client reboot

    - by Andrew J. Brehm
    Sometimes (but often enough to anoy) Remote Desktop Connection cannot connect to a server (2008 R2 but maybe also 2003) and claims that "The connection was denied because the user account is not authorized for remote login." The user is always authorized for remote login and the connection works from other clients. (Although this is the very same message that appears when a user really isn't autorized for remote login.) The problem always goes away after a client restart. The client is always Windows 7 but I have no (other) reason to assume that it only affects Windows 7 clients. Any idea what causes this?

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  • How to setup a virtual machine in Ubuntu desktop to run Debian Server

    - by stickman
    I want to run a virtual machine in my Ubuntu desktop that runs a Debian server. The purpose of this is to generate Debian packages. I have some C++ applications that were originally developed on my Ubuntu machine, and I need to (re)compile them on a Debian server in order to: build Deb packages for deployment on a Debian server make sure that the applications will definitely work on a debian server The idea is so that I can do 90% of my development on Ubuntu (where I am more comfortable), and deploy a binary package that definitely works on Debian. BTW, I am developing on Karmic Kola (Ubuntu 9.10).

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  • Windows 7 changes desktop icon location when switching from External Monitor to Internal Monitor (laptop)

    - by Gareth Jones
    I have a Windows 7 Laptop, and lately its been acting really weird with my 1080p Monitor. When I get home from school, Ill plug my screen in, and close my laptop lid (which makes the laptop treat the Monitor as the primary and only screen). However it will move my desktop icons! This also happens when I remove / unplug the screen, as shown in the pictures. I hate this, as Im the kinda person who's use to every icon being in a set spot, and so am use to their location. Its a massive hassle to try and move the icons back to their original spot. Anyone have any ideas on how to fix this? Thanks P.S it could be due to the resolution of the screen's being different, but this never happened before in the past Icons on External Moniter (after having moved them manually back into place): Icons after unplugging external monitor (and so using Laptop screen):

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  • ASP .NET MVC Secure all resources

    - by Tim
    How to enable Authentication on whole controller and disable only for certain action methods. I want authentication for all resources. If I write something like that: [Authorize] public class HomeController : BaseController { //This is public [UnAuthorized] public ActionResult Index() { ViewData["Message"] = "Welcome to ASP.NET MVC!"; return View(); } //This is private resource public ActionResult PrivateResource() { return View(); } } Then anyone can access this resource. Do you have any ideas how to make it better way?

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  • Does HTML5 make Javascript gaming safer (more secure)?

    - by Sean Madigan
    I know that Javascript is an incredibly unsecure way of programming a persistent game, where for instance you are doing battle calculations in an RPG and then award XP through linking to a PHP page when they win that adds XP to a database (since the player could make their own javascript to always win or just look at the PHP page that you get sent to when you win and just go there anyway). So with that said, I'm wondering if HTML5 makes multiplayer/persistent games any safer in this regard, since I know it still uses Javascript. Or am I still doomed to rely entirely on server-side scripting for doing any calculations that award the player?

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  • Is there a secure p2p distributed database?

    - by p2pgirl
    I'm looking for a distributed hash table to store and retrieve values securely. These are my requirements: It must use an existing popular p2p network (I must guarantee my key/value will be stored and kept in multiple peers). None but myself should be able to edit or delete the key/value. Ideally an encryption key that only I have access to would be required to edit my key value. All peers would be able to read the key value (read-only access, only the key holder would be able to edit the value) Is there such p2p distributed hash table? Would the bittorrent distributed hash table meet my requirements?' Where could I find documentation?

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  • Problems installing Windows 7 on Dell Inspiron 531 desktop

    - by wardedmocha
    Hello. I am having a problem installing Windows 7 on a Dell Inspiron 531 desktop. I got the setup to run and now it was trying to restart and now the computer just beeps. Two times a second, one right after the other. The beep is not like a key is being held down. And the computer isn't showing anything on the screen. edit: this is a computer I am trying to fix there where two blue screen errors that I know of. the first one had something to do with a display driver the second one was unknown

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  • How to find what is causing Windows 7 Desktop pause

    - by user1009073
    Windows 7 64 bit. Been in use approx 2 years since last rebuild. Recently, system is misbehaving. Specifically, on bootup, I get the login screen. I login, I get my desktop wallpapers (2 monitors). I get one widget (Rainlender2). It now pauses for approx 12 minutes. After that time, it continues fine, without errors/popups. It acts like the delay never happens. How do I identify the cause of the delay?

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  • PHP REMOTE_ADDR and secure sessions

    - by Christopher McCann
    One of the ways I have used to make securer sessions in the past is to also record the clients IP address and user agent at the handshake. Each time the client moves a page and calls session_start() I also check that the IP address and user agent stored is still the same to prevent hiijacking. But if someone is connecting from say a company network then all the users will probably have the same external static IP address and they could also really easily be using the same user agent. Is there other metrics I can use which are local only to the physical machine? Thanks

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  • What are some arguments to support the position that the Dojo JavasScript library is secure, accessi

    - by LES2
    We have developed a small web application for a client. We decided on the Dojo framework to develop the app (requirements included were full i18n and a11y). Originally, the web app we developed was to be a "prototype", but we made the prototype production quality anyway, just in case. It turns out that the app we developed (or a variant of it) is going to production (many months hence), but it's so awesome that the enterprise architecture group is a little afraid. 508c compliant is a concern, as is security for this group. I now need to justify the use of Dojo to this architecture group, explicitly making the case that Dojo does not pose a security risk and that Dojo will not hurt accessibility (and that Dojo is there to help meet core requirements). Note: the web app currently requires JavaScript to be turned on and a stylesheet to work. We use a relatively minor subset of Dojo: of course, dojo core, and dijit.form.Form, ValidationTextBox and a few others. We do use dojox.grid.DataGrid (but no drag N drop or editable cells, which are not fully a11y). I have done some research of my own, of course, but I any information or advice you have would be most helpful. Regards, LES2

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  • Amazon S3 as secure backup without multiple invoices

    - by Tom Viner
    I'm storing copies of database backups on Amazon S3 using the Python Boto library. But I worry that if my web server was hacked, those backups could be deleted using the credentials I need to do the upload. Ok, so I know you can grant permissions to another Amazon email address, so I can imagine doing that after an upload then removing the original user's write access BUT in this scenario I now end up with 2 accounts and 2 sets of invoices to give to accounts every month. Is there a solution to this that doesn't require a new Amazon account for each web server I run?

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  • Mac has "show desktop" function? [closed]

    - by George2
    Hello everyone, I am using MacBook Pro Mac OS 10.5. I am new to this development environment. I am previous working on Windows. I am wondering whether there is similar function like "show desktop" (shortcut is Windows Key + D) on Mac to Windows, which will hide all applications and show a clean desktop? THis function is very convenient for my development on Mac. thanks in advance, George

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  • Secure automated SSH/SFTP after reboot

    - by mozillalives
    I need to give a daemon ssh access to a particular server. Currently I have it setup to use ssh keys and a keychain, but the trouble with this method is if a reboot occurs. Unless I'm missing something, I would need to login after a system reboot and add the key to the keychain. Is there a way I could avoid/automate this? I'm considering using expect if I can't find any other way.

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  • Extremely poor WiFi reception on new desktop

    - by guy
    I just received a new desktop with a built-in WiFi card (Windows 7 Home Premium x64). However, I am only able to receive any WiFi signal when the computer is within 1-2 meters of a router. Even then, the signal is very weak (Windows 7 says it is "poor"). I have tried this with 2 different routers and see similar results. I have somewhere around a dozen other devices that can connect to both routers with greater signal strength (usually full strength) from much, much further away. When I tried calling support I was instructed to reinstall my drivers and attempt to change the WiFi channel of the router. Neither worked. I was then told that the problem was with my routers and that the computer was functioning normally and that it was certainly not a hardware problem. What would be the cause of this and is there anything I can do to fix it?

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  • Mysterious "media" volume mounted on desktop Mac OS X

    - by Allen
    I have a mysterious volume mounted on my desktop that I can't seem to forcibly unmount. I've tried using umount and also diskutil, but it seems to automatically remount itself. I've copied my hdd with Time Machine, and copied it onto a new computer, and it also has the drive mounted on it. It's not pointing to anything and I can't open it, nor can I forcibily remove it by hand with rm -Rf. Any ideas? I noticed this problem after I upgraded to Mountain Lion from Lion. It causes problems because when I try to select a file using the built in Finder dialog box, it freezes for a few minutes because it tries to cache or read into the "media" mounted volume.

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  • Changing Windows 'hosts' file in guest OS under Parallels Desktop 6 on Mac [migrated]

    - by ling
    I am running Win7 in a Parallels Desktop 6 on Mac. On the mac, I use /etc/hosts : 127.0.0.1 mysite and it works fine : I can type mysite in the url and the website will display. What I want to do is be able to reproduce the same on Win7 with IE8 for example. Another guy did it successfully here but I can't : Parallels: How to see a Mac-hosted website from Windows? On Mac : ifconfig -a vnic0 10.211.55.2 on Win7 I tried this C:\Windows\System32\drivers\etc\hosts 10.211.55.2 mysite What am I missing ?

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  • How to recover partially removed components of ubuntu-desktop?

    - by Rick_2047
    So I was messing around with tasksel to install LAMP. Foolishly I unchecked the ubuntu-desktop item. About 25% through the process I realized it is removing my desktop components. So I closed the terminal window, but now maybe something went wrong. Many default applications are gone and I can't even boot into the desktop. I have a separate home folder so I don't really have to worry about data, but I did install a lot of other software which would be gone if I take reformat and reinstall. So is there a way to recover the desktop from a live CD?

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  • How to create launch icons on Ubuntu Desktop?

    - by MattSlay
    I installed Ubuntu in a VM using VirtualBox, and after a few hours of Googling all the things I had to install and configure for the rest of the environment, I am finally up and running with a Ruby on Rails IDE and have MySql up and running. After I start up the Ubuntu VM, I have to go to a terminal window and do this to start MySql: /etc/init.d/mysql start So that works fine, but, since I am such a GUI person, I’m wondering how I can create an icon on the Ubuntu Desktop that I can click on to launch this command. Can you tell me how to do that?

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  • Making AJAX calls secure

    - by iamdadude
    What happens if a user looks at my JavaScript file, copies the content of a function and sends a request to my server using AJAX? And is there a way to properly protect against this from happening?

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  • How to secure images with Rails?

    - by NotDan
    I have a gallery in my rails app that needs to only allow certain images to be shown to specific, logged in users. I am using Paperclip for image processing now, but it saves all images in a public folder available to anyone. Note that I don't have to use Paperclip if there is a better way, and I already have the login system in place. I just need a way to place the images in a non-public location, but still be able to serve them as needed. Is it possible to only allow these images to be served to authenticated users?

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  • Symfony: Routing 'secure' and 'login' actions to another application

    - by Darmen
    Hello, Suppose we have 3 apps - appMain, app1 and app2. Applications 1 and 2 are protected, they have is_secure: true and everything works fine with sfDoctrineGuard plugin. A behavior I want to achieve is when a user is not authenticated, current application to forward him to another one, say appMain with defined module and action. Is that possible? Or can someone tell me where to dig about security mechanisms in symfony?

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  • Transferring whole folders using Dropbox without the desktop app

    - by Ender
    Is there any way I can upload whole folders to my Dropbox account without the desktop application? I am syncing my home computer to a computer at university and the university computers do not allow users to install applications anywhere, meaning that I cannot use the Dropbox utility to share my folders. I've attempted to use the online utility (on the website) to share my files, but much of my work is spanned over dozens of files all within their own folders. All you can do with the upload feature on the website is upload files and for my projects this would take a long time.

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  • WD Elements Desktop External - Not recognised on a single computer

    - by Aelexe
    My WD Elements Desktop External is no longer recognised on my main computer. It has worked fine in the past, but now all of a sudden is not detected. It does not prompt when plugged in, nor does it show up in the disc management interface or the device manager. It appears to be aware that it is plugged in however as the light on the external blinks rapidly for a short while after being plugged in. The strangest thing however is that it works fine on other computers, including my family computers and my laptop. I have attempted to troubleshoot the issue by trying various USB devices in multiple ports on each system to see if there is any correlation with the issue, but have come up with nothing that gives me an idea of what is going on. I have also attempted to format the external using my laptop, but that has not helped either. If anyone has had a similar issue, or knows of any potential solutions, please post your advice. Thanks for your time.

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