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• What does 'salt' refer to in string-to-key (s2k) specifier?

  - by WilliamKF

  What does 'salt' refer to in string-to-key (s2k) specifier? It appears to be a random number generator to shake things up, but I would like to know what 'salt' stands for? For example it is written: 3.6.1.2. Salted S2K This includes a "salt" value in the S2K specifier -- some arbitrary data -- that gets hashed along with the passphrase string, to help prevent dictionary attacks. Octet 0: 0x01 Octet 1: hash algorithm Octets 2-9: 8-octet salt value Salted S2K is exactly like Simple S2K, except that the input to the hash function(s) consists of the 8 octets of salt from the S2K specifier, followed by the passphrase. But salt is not defined, although its meaning seems clear.

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• Job Search Engine Url Structure Issue [closed]

  - by Justin

  Possible Duplicate: What is the best stucture of SEO friendly URL? I am working on a job board, and i'm trying to figure out a good design for URL structure. Some things that I have found through research: 100 - 150 Chars long is ideal 3-5 words in your url, according to Matt Cutts Use .htaccess to force clean urls Do not duplicate data (important) Clean and precise, describing the content Use hyphens On the homepage, I try to detect the users location based on IP, but this isn't always accurate, and not always reliable. So until they put in their city/location, I can't always use this structure but this is potentially work-able. For Searching, a form post to a results page: domain.com/jobs/[city]/[search] ie: domain.com/jobs/toronto/sales manager/ OR domain.com/search/jobs/toronto/sales manager/ or do I remove the word JOBS and just use Search. I trying to keep good search terms in the URL, but also keep it clean and concise. Can someone give me some feedback and thoughts to 'why'...

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• Tips for communication between JS browser game and node.js server?

  - by Petteri Hietavirta

  I am tinkering around with some simple Canvas based cave flyer game and I would like to make it multiplayer eventually. The plan is to use Node.js on the server side. The data sent over would consists of position of each player, direction, velocity and such. The player movements are simple force physics, so I should be able to extrapolate movements before next update from server. Any tips or best practices on the communications side? I guess web sockets are the way to go. Should I send information in every pass of the game loop or with specified intervals? Also, I don't mind if it doesn't work with older browsers.

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• FormatDate in Display Item Form Webpart

  - by H(at)Ni

  I've faced an issue that I wanted to display the date in the format of ('MMMM dd') that is retrieved from a sharepoint list in an arabic site collection. So, after googling this issue, I've found out that a possible solution to my poblem is using the function ddwrt:FormatDateTime that can be used as long as you'll include the following namespace xmlns:ddwrt="http://schemas.microsoft.com/WebParts/v2/DataView/runtime" My purpose was solved by writing this line of code in my xsl code behind for the webpart : ddwrt:FormatDateTime(string(@StartDate),3073,'MMMM dd') but that worked only if the webpart is inserted into an English site . After trying to search but in vain, I started to use my guesses that ended up doing something like that: ddwrt:FormatDateTime(ddwrt:FormatDateTime(string(@StartDate),3073,'dd/MM/yyyy'), 3073, 'MMMM dd') And the cause of the problem was that sharepoint parses the date as 'MM/dd/yyyy' which I think could be related to server regional settings, so I had to force it to parse the date in arabic-Egypt format as 'dd/MM/yyyy' in order to get the correct 'Month Day' format as expected.

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• Windows 7 notebook turn off by itself, how to check if it is due to CPU being too hot?

  - by Jian Lin

  I have a Dell Studio 15 notebook, and it just started turning off by itself yesterday. Could it be that the CPU is too hot? I have had several notebooks before and every one of them I can put them on the bed without any problem. This Dell Studio Notebook, however, seems like have the air / fan outlet pointed outward from the bottom back of the notebook, so I suspect that the air is partially blocked when it is on the bed. Are there Win 7 tools that can monitor the CPU temperature, or will some 3rd party tool be needed? (I try to stick to official tools nowadays). Also, it is running Win 7 Ulitmate, there is actually no utility or background service from Win 7 or from Dell that detects when the temperature is too hot (or 95% near the max), pop out a message box giving a warning and say that the computer will go into sleep mode in 1 minute, but instead just turn off the computer by brute force (cutting out the power) right then and there? Update: it turned off right in front of my eyes -- it is not doing any windows update or anything. just normal use and jooooop, it turned off.

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• Physics-based dynamic audio generation in games

  - by alexc

  I wonder if it is possible to generate audio dynamically without any (!) audio assets, using pure mathematics/physics and some input values like material properties and spatial distribution of content in scene space. What I have in mind is something like a scene, with concrete floor, wooden table and glass on it. Now let's assume force pushes the glass towards the edge of table and then the glass falls onto the floor and shatters. The near-realistic glass destruction itself would be possible using voxels and good physics engine, but what about the sound the glass makes while shattering? I believe there is a way to generate that sound, because physics of sound is fairly known these days, but how computationaly costy that would be? Consumer hardware or supercomputers? Do any of you know some good resources/videos of such an experiment?

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• How can I create a symlink to the location that Ubuntu 10.10 mounts a CD?

  - by Michael Curran

  In Ubuntu 10.10, when I insert a CD or DVD into my optical drive, the system mounts the CD in a folder called /media/XYZ where XYZ is the disk's label. This has cause problems with Wine, as in order for an application to verify that an application's CD is present, Wine uses a symlinks to point to a mounted CD's folder. In this case, that folder must be /media/XYZ, but when using a different application, the folder would be different. I would like to know if there is a way to create a symlink that will always point to the mounted folder from a given /dev/cdrom* device, or how to force the system to always mount CDs to the same address (i.e. /media/cdrom).

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• Simple 3D Physics engine as a part of graduation project [on hold]

  - by Eugene Kolesnikov

  I am working on my graduation project and one part of it is to simulate the motion of a rigid body in 3D space. I can use either already written physics engine or to write it myself. It's quite an interesting challenge for me, so I would like to do it myself. I am able to use either C++ or Java for programming (prefer C++). I am using Mac OS X and Debian 7. Could you suggest any guides or tutorials how to do it, can't find it anywhere... More precisely, I need a very simple engine, without collision detection, and many other things that I do not know, I just need to calculate the forces and move my body, depending on the resultant force. If you think that this task is still very difficult or there is no such tutorial, please suggest me some good and simple engine.

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• Blocking an IP in Webmin

  - by Dan J

  I've been checking my /var/log/secure log recently and have seen the same bot trying to brute force onto my Centos server running webmin. I created a chain + rule in Networking - Linux Firewall: Drop If source is 113.106.88.146 But I'm still seeing the attempted logins in the log: Jun 6 10:52:18 CentOS5 sshd[9711]: pam_unix(sshd:auth): check pass; user unknown Jun 6 10:52:18 CentOS5 sshd[9711]: pam_succeed_if(sshd:auth): error retrieving information about user larry Jun 6 10:52:19 CentOS5 sshd[9711]: Failed password for invalid user larry from 113.106.88.146 port 49328 ssh2 Here is the contents of /etc/sysconfig/iptables: # Generated by webmin *filter :banned-ips - [0:0] -A INPUT -p udp -m udp --dport ftp-data -j ACCEPT -A INPUT -p udp -m udp --dport ftp -j ACCEPT -A INPUT -p udp -m udp --dport domain -j ACCEPT -A INPUT -p tcp -m tcp --dport 20000 -j ACCEPT -A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT -A INPUT -p tcp -m tcp --dport https -j ACCEPT -A INPUT -p tcp -m tcp --dport http -j ACCEPT -A INPUT -p tcp -m tcp --dport imaps -j ACCEPT -A INPUT -p tcp -m tcp --dport imap -j ACCEPT -A INPUT -p tcp -m tcp --dport pop3s -j ACCEPT -A INPUT -p tcp -m tcp --dport pop3 -j ACCEPT -A INPUT -p tcp -m tcp --dport ftp-data -j ACCEPT -A INPUT -p tcp -m tcp --dport ftp -j ACCEPT -A INPUT -p tcp -m tcp --dport domain -j ACCEPT -A INPUT -p tcp -m tcp --dport smtp -j ACCEPT -A INPUT -p tcp -m tcp --dport ssh -j ACCEPT -A banned-ips -s 113.106.88.146 -j DROP COMMIT # Completed # Generated by webmin *mangle :FORWARD ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed # Generated by webmin *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed

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• Why must I restart for HDMI audio?

  - by David Shochat

  I have a System76 Lemur Ultra laptop, which has an HDMI port. When I plug in the HDMI cable, it is recognized immediately for video, but not for audio, i.e., it does not show up in the Output tab of the Sound Settings dialog. However, if I do a full restart with the cable plugged in, then it does show up and can be selected. I've also discovered that manually killing and restarting pulseaudio with the HDMI plugged in will force it to be recognized as an available audio output. So my question is, what is broken here? I've thought about writing a bug in launchpad, but I don't know which component is malfunctioning. Is it the kernel? ALSA? Pulse Audio? Something else? By the way, the same bug seems to exist in reverse, namely if I disconnect the HDMI, it is still listed in the Output tab until I again restart the OS. This is 12.04 LTS.

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• Swichable Graphics

  - by user67291

  Im having a bit of a problem with my 2 graphic card in my laptop. laptop: Acer Aspire 5553g Graphic Cards: Performance: ATI Mobility Radeon HD 5650 Power saving: ATI Radeon HD 4200. On this laptop i have used ubuntu 11.04, then upgraded to 11.11, and now upgraded to 12.04 the other day. The problem is that sins i upgraded to 12.04 im unable to switch to my performance graphic card using the Catalyst Control Center. Under 11.04 and 11.11 it was no problem. I open the Catalyst Control Center and select the performance option then apply, it tels me that it will be applied after reboot, I reboot and nothing has changed. Im able to "force" it by changing in BIOS, so i know there is nothing wrong with the card. Thanks /Daan

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• WS2008 subst in Logon script does not "stick"

  - by Frans

  I have a terminal server environment exclusively with Windows Server 2008. My problem is that I need to "map" a drive letter to each users Temp folder. This is due to a legacy app that requries a separate Temp folder for each user but which does not understand %temp%. So, just add "subst t: %temp%" to the logon script, right? The problem is that, even though the command runs, the subst doesn't "stick" and the user doesn't get a T: drive. Here is what I have tried; The simplest version: 'Mapping a temp drive Set WinShell = WScript.CreateObject("WScript.Shell") WinShell.Run "subst T: %temp%", 2, True That didn't work, so tried this for more debug information: 'Mapping a temp drive Set WinShell = WScript.CreateObject("WScript.Shell") Set procEnv = WinShell.Environment("Process") wscript.echo(procEnv("TEMP")) tempDir = procEnv("TEMP") WinShell.Run "subst T: " & tempDir, 3, True This shows me the correct temp path when the user logs in - but still no T: Drive. Decided to resort to brute force and put this in my login script: 'Mapping a temp drive Set WinShell = WScript.CreateObject("WScript.Shell") WinShell.Run "\\domain\sysvol\esl.hosted\scripts\tempdir.cmd", 3, True where \domain\sysvol\esl.hosted\scripts\tempdir.cmd has this content: echo on subst t: %temp% pause When I log in with the above then the command window opens up and I can see the subst command being executed correctly, with the correct path. But still no T: drive. I have tried running all of the above scripts outside of a login script and they always work perfectly - this problem only occurs when doing it from inside a login script. I found a passing reference on an MSFN forum about a similar problem when the user is already logged on to another machine - but I have this problem even without being logged on to another machine. Any suggestion on how to overcome this will be much appreciated.

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• What are the internal limits to WCF

  - by ligos

  WCF has lots of limits imposed on it to protect against DoS attacks and other developer brainlessness. What are these limits? And how can they be overriden? Specifically, if I was to try to send a large number of messages in a short period of time to a variety of different clients, what are the internal WCF limits they may cause messages to be sent slowly. PS: this question is a much shorter version of my previous question that did not get much attention. EDIT I have answered the original question. The issue being my async calls were being turned into synchronous ones.

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• Insane load average after reboot

  - by Gazzer

  After doing a reboot of Ubuntu server 12.04 LTS (after an apt-get dist-upgrade) my server load (on a 16GB) machine goes insane (around 80) for about 10 or 15 minutes The only things I can think of are these two processes: /usr/bin/mysql --defaults-file=/etc/mysql/debian.cnf --skip-column-names --batch -e ? select concat('select count(*) into @discard from `',? TABLE_SCHEMA, '`.`', TABLE_NAME, '`') ? from information_schema.TABLES where ENGINE='MyISAM' /usr/bin/mysql --defaults-file=/etc/mysql/debian.cnf --skip-column-names --silent --batch --force -e select count(*) into @discard from `information_schema`.`PARTITIONS` Is this normal?

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• Whenever I try to remove a Debian package I receive an Error

  - by Brenton Horne

  Whenever I type into the terminal the command: sudo dpkg -r '/home/brentonhorne/Downloads/virtualbox.deb' I receive the error: dpkg: error: --remove needs a valid package name but '/home/brentonhorne/Downloads/virtualbox.deb' is not: illegal package name in specifier '/home/brentonhorne/Downloads/virtualbox.deb': must start with an alphanumeric character Type dpkg --help for help about installing and deinstalling packages [*]; Use `dselect' or `aptitude' for user-friendly package management; Type dpkg -Dhelp for a list of dpkg debug flag values; Type dpkg --force-help for a list of forcing options; Type dpkg-deb --help for help about manipulating *.deb files; Options marked [*] produce a lot of output - pipe it through `less' or `more' ! How do I get around this problem?

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• How do I format this regex so it will work in fail2ban?

  - by chapkom

  I've just installed fail2ban on my CentOS server in response to an SSH brute force attempt. The default regular expressions in fail2ban's sshd.conf file do not match any entries in audit.log, which is where SSH seems to be logging all connection attempts, so I am trying to add an expression that will match. The string I am trying to match is as follows: type=USER_LOGIN msg=audit(1333630430.185:503332): user pid=30230 uid=0 auid=500 subj=user_u:system_r:unconfined_t:s0-s0:c0.c1023 msg='acct="root": exe="/usr /sbin/sshd" (hostname=?, addr=<HOST IP>, terminal=sshd res=failed)' The regular expression I am attempting to use is: ^.*addr=<HOST>, terminal=sshd res=failed.*$ I've used regextester.com and regexr to try to build the regex. The testers give me a match for this regex:^.*addr=\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}, terminal=sshd res=failed.*$ but fail2ban-regex complains if I don't use the <HOST> tag in the regex. However, using ^.*addr=<HOST>, terminal=sshd res=failed.*$ gives me 0 matches. At this point, I am totally stuck and I would greatly appreciate any assistance. What am I doing wrong in the regex I am trying to use?

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• how to make ext4 more reliable?

  - by amin

  hi dears as ext4 introduced more reliable than ext3 with block journals, is there any chance to suppose it 100% reliable? what if enabling block journaling on it, which is disabled by default? as friend's guide to explain my case in more detail: i have an embedded linux device, after installation keyboard and monitor is detached and it works standalone. my duty is to make sure it has reliable file-system so with errors there is no way to fsck on device. i can't force my customer to use a ups with each device to ensure no fault by power-failure. what can you offer me more than enabling block journaling? thanks in advance

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• URL Rewrite http to https EXCEPT files in a specific subfolder

  - by BrettRobi

  I am trying to force all traffic on my web site to use HTTPS, using the URL Rewrite 2.0 module added to IIS 7.5. I got that working and now have a need to exclude a couple of pages from using SSL. So I need a rule to rewrite all URL except those referencing this folder to HTTPS. I've been banging my head against the wall on this and am hoping someone can help. I tried creating a rule to match all URL except those in a nossl subfolder as in this example: <rule name="HTTP to HTTPS redirect" enabled="true" stopProcessing="true"> <match url="(/nossl/.*)" negate="true" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="false"> <add input="{HTTPS}" pattern="off" /> </conditions> <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="Found" /> </rule> But this doesn't work. Can anyone help?

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• What is the sense of permiting the user to use no passwords longer than xx chars?

  - by reox

  Its more like a usability question or maybe database, or even maybe security (consider injection attacks) but what is the sense of permiting the user's password to a be not longer than xx chars? It does not make any sense to me, because longer passwords are mostly considered better and even harder to crack, and some users use password safes, so the password length should not matter. I understand that passwords with more than 20 chars are hardly to remember, but if you use diceware or password safe you dont have any problem with that. I really cant understand why there are sites that say "your password need to be between 5 and 8 chars"... also should the password saved as hash, so the length of the field in the database is fixed, so where is the problem? i think that most of the sites where the password is has to be a fixed length are not even using any hashing method...

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• What Are the Windows A: and B: Drives Used For?

  - by Jason Fitzpatrick

  The C: drive is the default installation location for Windows, if you have a CD/DVD drive on your machine it’s likely the D: drive, and any additional drives fall in line after that. What about the A: and B: drives? Image by Michael Holley. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. HTG Explains: What is DNS? How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU

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• How to Power Cycle Your Gadgets To Fix Freezes and Other Problems

  - by Chris Hoffman

  Have you ever had a smartphone, laptop, tablet, or any other electronic gadget become unresponsive? The surefire way to recover from the freeze – assuming it’s not a hardware problem – is by power-cycling the gadget. Most geeks know that pulling and reinserting a device’s battery will force it to recover from a freeze and boot right back up, but what if the device doesn’t have a removable battery? Image Credit: Alan Levine on Flickr Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Is php fileinfo sufficient to prevent upload of malicious files?

  - by Scarface

  Hey guys, I have searched around a bit, and have not really found a professional type response to how to have secure fileupload capability so I wanted to get the opinion of some of the experts on this site. I am currently allowing upload of mp3s and images, and while I am pretty confident in preventing xss and injection attacks on my site, I am not really familiar with fileupload security. I basically just use php fileinfo and check an array of accepted filetypes against the filetype. For images, there is the getimagesize function and some additional checks. As far as storing them, I just have a folder within my directory, because I want the users to be able to use the files. If anyone could give me some tips I would really appreciate it.

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• Using Robocopy to Backup to a NAS

  - by Your DisplayName here!

  When using Robocopy to backup data to a NAS, I always had the problem that most files were considered “old” on the NAS device (even if they weren’t) – that kind of defeats the purpose of the /MIR switch. Today I finally decided to search for a solution – and it was remarkably easy. Most NAS devices use Samba or something similar to provide “NTFS shares” – but most of them only implement FAT-style file times with a 2-second-granularity. You can force robocopy to use FAT file time as well using the /FFT switch. Now my backup script works again as expected. See also here.

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• How to replace GRUB with BURG without overwriting MBR?

  - by StepTNT

  I'd like to install BURG but I don't want it to overwrite my MBR. That's because I've got two bootloaders in my system : Default Windows 7 in MBR Grub in /dev/sda2 With the first power button, it will boot into Windows and with the second button it boots from /dev/sda2, loading Grub and then Kubuntu. Now I want to replace GRUB with BURG. I've installed Burg with burg-install /dev/sda2 --force because I don't want my MBR to be overwritten (pressing the first power button MUST load Windows and avoid showing any sign of Linux). Setup was completed without errors, If I open burg-manager it loads my settings, allowing me to change them and to test everything with burg-emu, so I've changed my settings but the second power button still loads GRUB (Even a different version from the default Kubuntu one). How can I replace GRUB that's on /dev/sda2 with BURG and without overwriting MBR?

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• My laptop hangs a lot

  - by Salahuddin

  My laptop is 1G ram and 120G hard-disk 1.68HZ processor , I've both Ubuntu and Windows7 on my machine For the last few days, my laptop, running Ubuntu 11.10 has been hanging a lot. A lot of the time, the touchpad won't work for unknown reasons, and I have to connect a USB mouse to be able to move the pointer on the screen. When browsing the web, the browser hangs a lot, and I have to restart the laptop to refresh it. I know that there is a hotkey to force Ubuntu to refresh when it hangs, but it doesn't work here.These problems happens only on ubuntu not on windows 7... How do I make Ubuntu light and fast? Help me, please.

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