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• Is it okay to truncate a SHA256 hash to 128 bits?

  - by Sunny Hirai

  MD5 and SHA-1 hashes have weaknesses against collision attacks. SHA256 does not but it outputs 256 bits. Can I safely take the first or last 128 bits and use that as the hash? I know it will be weaker (because it has less bits) but otherwise will it work? Basically I want to use this to uniquely identify files in a file system that might one day contain a trillion files. I'm aware of the birthday problem and a 128 bit hash should yield about a 1 in a trillion chance on a trillion files that there would be two different files with the same hash. I can live with those odds. What I can't live with is if somebody could easily, deliberately, insert a new file with the same hash and the same beginning characters of the file. I believe in MD5 and SHA1 this is possible.

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• Disk full, how to move mysql database files?

  - by kopeklan

  my database files located in /var/lib/mysql which located in partition /dev/sda5 this partition is full (refer here for details) so I'm going to move the location of database files from /var/lib/mysql to /home/lib/mysql What is the right way to move this database files? Im going to do this steps: Stop http server and PHP Change datadir=/var/lib/mysql to become datadir=/home/lib/mysql in /etc/my.cnf move all database files to the new location run killall -9 mysql, then /etc/init.d/mysqld start Start http server and PHP Is this right? Correct me if I'm wrong added: currently, mysql won't stop. refer here: mysql wont stop, mysqld_safe appeared in top

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• SELECT subset from two tables and LEFT JOIN results

  - by Doctor Trout

  Hi all, I'm trying to write a bit of SQL for SQLITE that will take a subset from two tables (TableA and TableB) and then perform a LEFT JOIN. This is what I've tried, but this produces the wrong result: Select * from TableA Left Join TableB using(key) where TableA.key2 = "xxxx" AND TableB.key3 = "yyyy" This ignore cases where key2="xxxx" but key3 != "yyyy". I want all the rows from TableA that match my criteria whether or not their corresponding value in TableB matches, but only those rows from TableB that match both conditions. I did manage to solve this by using a VIEW, but I'm sure there must be a better way of doing this. It's just beginning to drive me insane tryng to solve it now. (Thanks for any help, hope I've explained this well enough).

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• How to refresh an activity?

  - by poeschlorn

  Hi Guys, after implementing some Android Apps, including several Map activities, I try to refresh the activity when the GPS listener's onLocationChanged() mehtod is called. I have no Idea how to tell the map activity to refresh on its own and display the new coords... the coords to store will have to be in global values, so that the location listener will have access to it. In my sample GPS-class (see code below) I just changed the text of a text view....but how to do that in map view? private class MyLocationListener implements LocationListener { @Override public void onLocationChanged(Location loc) { final TextView tv = (TextView) findViewById(R.id.myTextView); if (loc != null) { tv.setText("Location changed : Lat: " + loc.getLatitude() + " Lng: " + loc.getLongitude()); } } I think the solution of this Problem won't be very difficult, but I just need the beginning ;-) This whole app shall work like a really simple navigation system. It would be great if someone could help me a little bit further :) nice greetings, Poeschlorn

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• Book recommendation for a Ruby dev learning Java

  - by cpjolicoeur

  I've been a Ruby developer for the past 4-5 years, and prior to that coded in Perl and a language called ProvideX for years. As hard as it may seem, I've never written a Java application short of the basic Hello World app probably a decade ago. I'm beginning to start doing some Android development to port some iPhone applications we did for a client over to the Android platform. As such, I'm wondering what the best reference book I can buy is to get up to speed quickly with the features (and peculiarities) of Java. There are numerous "Learn Ruby for Java programmers" out there, but not really any reference books for going the otherway of Ruby-to-Java. I'm looking for something preferably like the "Learn Perl the Hard Way" book. I know how to code, I just need a reference on learning the proper mechanics of Java after having done Ruby (and a bit of Obj-C) work exclusively for the past few years.

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• CHROOT for shell script testing

  - by Josh

  I am looking at setting up a shell script in order to properly document and automate the process I am using to setup a few servers we have. In order to test the shell script through its different stages I was thinking a CHROOT would be ideal, since I can wipe out the "virtual root" and create it on the fly. I have never used CHROOT before, however. I was just curious what are the exact steps I would need to follow to implement this process of creating a chroot (with the basic core functions that would be needed to install apache/php/etc.)? and then destroying it?

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• Removing python and then re-installing on Mac OSX

  - by JudoWill

  I was wondering if anyone had tips on how to completely remove a python installation form Mac OSX (10.5.8) ... including virtual environments and its related binaries. Over the past few years I've completely messed up the installed site-packages, virtual-environments, etc. and the only way I can see to fix it is to just uninstall everything and re-install. I'd like to completely re-do everything and use virtualenv, pip, etc. from the beginning. On the other hand if anyone knows a way to do this without removing python and re-installing I'd be happy to here about it. Thanks, Will

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• NFS share access - Permission denied

  - by rgngl

  I'm trying to share a directory on my NAS device(WD Mybook WE) with NFS to another machine on my local network. The directory on the NAS device looks like this: drwxr-x--- 15 git git 4096 Nov 17 01:05 git/ And id's of the user git on the NAS device is like this: [root@myhost DataVolume]# id git uid=505(git) gid=505(git) I played with many different parameters in the /etc/exports file and this is what I got there currently: /DataVolume/git 192.168.0.20(async,rw,no_root_squash,no_subtree_check) On the client side I have the user git and group git with the same id's to match the ones on the server. user@myclient:~$ id git uid=505(git) gid=505(git) groups=505(git) I mount the directory with: sudo mount myhost:/DataVolume/git -t nfs git/ and the mounted directory looks like: drwxr-x--- 15 git git 4096 Nov 17 01:05 git After these steps I can't seem to cd to that directory with any user, including git and root. I am getting a Permission denied error. Thanks in advance for any help.

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• My AES encryption/decryption functions don't work with random ivecs

  - by Brendan Long

  I was bored and wrote a wrapper around openSSL to do AES encryption with less work. If I do it like this: http://pastebin.com/V1eqz4jp (ivec = 0) Everything works fine, but the default ivec is all 0's, which has some security problems. Since I'm passing the data back as a string anyway, I figured, why not generate a random ivec and stick it to the front, the take it back off when I decrypt the string? For some reason it doesn't work though. With random ivec: http://pastebin.com/MkDBFcn6 Well actually, it almost works. It seems to decrypt the middle of the string, but not the beginning or end: String is: 0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF Encrypting.. ???l%%1u???B! ?????`pN)?????[l????{?Q???2?/?H??y"?=Z?Cu????l%%1u???B! Decrypting.. String is: ?%???G*?5J?0??0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF!-e????V?5 I honestly have no idea what's going wrong. Maybe some stupid mistake, or maybe I'm missing something about AES?

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• Remote desktop from internet to windows 7 box via linksys router

  - by larryq

  Hi everyone, I have a linksys wrt54g router and a windows 7 box at home I'd like to be able to remote desktop into from work. Would it be possible for someone to point me in the right direction on what I need to configure to get this working, both on the router and on the win 7 box? I'm sure there are a lot of little steps involved. Ideally I'd like to set it up so that only my work IP address can get through to the win 7 machine. Thanks very much for any pointers and links!

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• Need help from CSS purist!

  - by Darcy

  I'm beginning to use CSS more and more but I'm not sure if I'm using it as intended in all cases. I have classes named things like 'box' that will wrap the content inside it with a border, which seems like good CSS to me. On the other hand I have classes like 'margin-right-5' and 'float-left' that sets the css to margin-right: 5px and float:left respectively. I'm wondering if this is good practice. Then in my markup I'd do something like: <div class="box float-left margin-right-5"> <!-- CONTENT HERE --> </div> Sometimes I may want to float right or not have a margin at all and still use the 'box' class, so I use several classes in order to make the css more flexible. Am I destroying the principles of CSS?

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• Audio splitting and noise removal on Windows

  - by pts

  My mother has about 100 hours of audio in a mix of MP3 and WAV files, the digitized versions of her vinyl records. Each file contains about 5 songs with a few seconds of (noisy) pause between them. My mother needs software for Windows XP with which she can listen to the files, find the gaps manually, split the files at the gaps found, reduce noise on each song, and export the songs to individual MP3 files. My mother has very limited software user skills and affinity, and she doesn't speak English. The simpler the software, the better for her, even if noise reduction is worse than with a more sophisticated, but more complicated software. I'd prefer free software, freeware or shareware (which can do all above). Please recommend something much simpler than Audacity. The software should guide the user through the process, always showing the next few available steps, and being intuitive in the sense that there are only a few allowed actions and it's obvious what they are and how to activate them. Which software would you recommend?

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• Support both Standard mode and Quirks mode? Is that possible and necessary?

  - by tshao

  Today I was assigned a bug saying that some page elements don't work on IE8 Quirks mode at all, and I need to fix them. The point is that I believe our pages will always be rendered in Standard mode, because we specify DOCTYPE at the beginning of every page (via master page). I'd think it must be some debugging tools changed that during testing. I managed to convice QA to close it as by design, after a brief explanation to her. Now I start to think the question that whether we should have our page work on both Standard and Quirks mode. Maybe we should try to minimize the problem even if the page is not rendering in a supposed mode? Any standard or best practices on that? Thanks!

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• Radiobuttonlist and load page in same initial position

  - by Khalid

  Hi I have this simple code in my page, I have a long page, if the client use this button then it shall reload the page and display the page from the beginning. I wish to be reload the page and display from the last position. <asp:RadioButtonList ID="RadioButtonList5" runat="server" AutoPostBack="True" RepeatDirection="Horizontal"> <asp:ListItem Value="45">Sheet2</asp:ListItem> </asp:RadioButtonList> Any advice, apprciated. Thank you.

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• Replace whitespaces using PHP preg_replace function ignoring quoted strings

  - by Saiful

  Look at the following string: SELECT column1 , column2, column3 FROM table1 WHERE column1 = 'text, "FROM" \'from\\\' x' AND column2 = "sample text 'where' \"where\\\" " AND ( column3 = 5 ) I need to escape unnecessary white space characters from the string like: removing white space from beginning and ending position of , ( ) etc removing newline (\r\n) and tabs (\t) But one thing. The remove process could not remove white spaces from the quoted string like: 'text, "FROM" \'from\\' x' "sample text 'where' \"where\\" " etc. i need to use the PHP function: preg_replace($pattern, $replacement, $string); So what will be the value of $pattern and $replacement where the value of $string is the given SQL.

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• problem with MySQL installation : template configuration file cannot be found

  - by user35389

  Trying to install MySQL onto the Windows XP machine. While going through the installation steps (in the "MySQL Server Instance Config. Wizard"), I get to a point where it the window reads: MySQL Server Instance Configuration (bold header) Choose the configuration for the server instance. Ready to execute... o Prepare configuration o Write configuration file o Start service o Apply security settings (this line is greyed out) Please press [Execute] to start the configuration. [ Back ] [ Execute ] [ Cancel ] So I press execute, and then a red X appears in the second step: Write configuration file and at the bottom, where it originally said: Please press [Execute] to start the configuration. It now says: The template configuration file cannot be found at C:\Program Files\MySQL\MySQL Server 5.0\bin\my-template.cnf I'm unsure what it means, but I canceled the config wizard and looked in the directory that had been created (C:\Program Files\MySQL\MySQL Server 5.0). There are some configuration settings files, and there are 4 folders: bin data Docs share

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• setting up ssh on minix 3.2

  - by Mark

  I have install MINIX 3.20 on VMware player on LINUX. Now, I am trying to ssh into Minix from the same Linux machine, but I am encountering some problems. First I installed openssh on MINIx then I tried to ssh onto the Minix virtual machine with ssh [email protected] but I got the following output: [email protected]'s password: Permission denied, please try again. [email protected]'s password: Permission denied, please try again. [email protected]'s password: Permission denied (publickey,password,keyboard-interactive). I am sure the password I entered is correct, I have tried to ssh into MINIX on MINIX and it worked but not when I tried it from my linux machine. I have followed the steps for setting up ssh from this webpage, but it didn't work as shown above.

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• How do I stop track changes from turning on automatically in Word 2007

  - by Benj

  Whenever I open an existing document in Word 2007 (on Windows XP), word turns on track changes, and changes the display mode to "Final" (that is, not "Final Showing Markup" -- so I often don't even notice track changes is on if I don't remember to pay attention. This happens for ALL existing documents, and doesn't happen for new documents. I can't find any option in the configuration that would control this behavior. I would like to restore the original/default behavior where documents are opening with Track Changes off, and in "Final showing markup" display. Steps to Reproduce Open Word 2007. Create a new document. Verify that track changes is off. Save the document and close Word. Open the document (either directly or through Word). Track changes is now on. Any ideas?

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• is PHP itself transforming into a framework?

  - by Elzo Valugi

  At the beginning PHP was a scripting language. But after the introduction and improvement of OOP I see more and more objects added to the core. They started with SPL which grew a lot, now we have DOMDocument family, DateTime family which should be part of PECL, Pear or Zend Framework or implemented by each one of us. Shouldn't be php only for build-in functions and all these objects passed to something else? Example. DateTime class is part of the core and I see it very similar with Zend_Date.

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• How to create a new public AMI for windows?

  - by user67081

  I am trying to make a windows 2008 AMI that is a nice clean 64bit starter pack (IIS, SQL express, ASP.NET MVC, etc...) I would like to make it a public AMI when its done. There in lies the problem. I can make an AMI from my image no problem. But I can't seen to get new instances to generate their own passwords.. The results are that I have a new instance that works great with my password. So what is the process of making my EBS backed Instances convert into an AMI that will auto-generate its password and do all the other setup steps that amazon wants to go thru when a new instance starts up? Thanks in advance.

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• create vmware virtual machine via command line on linux system

  - by tom smith

  evaluating/investigating vmware, and how you create a "virtual machine" using the command line for rhel/centos. basically, i want to be able to create a test virtual machine and then be able to run the VM on another system using the virtual player. so, i'm looking for pointers/articles/instructions that detail what i need (in terms of tools/apps) and the steps needed to accomplish this. i've seen a few articles/sites that discuss creating virtual machines, but they all involve using the GUI. thanks update:: while vmware is the company. there are different tools/apps provided to create a Virtual Machine. Basically, I want to do a test, to ultimately have a Virtual Machine/Image that can be run on a separate server using the vmplayer app I've seen docs that discuss using the GUI to create the VM, but haven't found any (yet) that discuss how to accomplish this using the command line approach. thanks...

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• File Explorer using Java - how to go about it?

  - by user299988

  Hi, I am set to create a file explorer using Java. The aim is to emulate the behavior of the default explorer as closely as possible, whatever may be the underlying OS. I have done NO GUI programming in Java. I have looked-up Swing, SWT and JFace, and I am beginning my project with this tutorial: http://www.ibm.com/developerworks/opensource/library/os-ecgui1/ I would like to know your opinions about the best approach to tackle this problem. If you could comment on complexity of coding, portability and OS-independence, and efficiency, it would be great. Is there anything else I should know? Do some other ways exist? Thanks a lot!

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• Time issues on the Network -- How to find the Root Cause

  - by Jeff

  A number of application servers started erroring out in my domain. Troubleshooting led me to a missconfiguration of NTP. I fixed the issue, but I don't know how the issue arose in the first place. The only errors I can find are System Error: 1097 Source: useenv System Error: 1058 Source: useenv System Error: 1030 Source: useenv System Error: 1000 Source: mmc How else can I find out why NTP started acting up on my domain? Is there any troubleshooting steps to diagnose why my DC started pulling from a random timeserver with the wrong time? EDIT: Current issue actually remains: the two 2003 DCs are not syncing with the PDC (a 2k8 box). w32tm /resync -- The computer did not resync because no time data was available.

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• Cisco Aironet 1200 Series AP Configuration

  - by nonterrorist

  I am attempting to configure a new CISCO Aironet 1200 Series Access Point to have a fixed IP. I have been searching online and I have come to the conclusion that the default IP address of this device is 10.0.0.1. These are the steps I have taken: My machine is plugged directly into the Ethernet port (not the Console port) of the AP. My Ethernet adapter is set to 10.0.0.2. I have reset the AP by holding the Mode button while powering up the device. The issue remains that I can not access 10.0.0.1 through the web, nor can I ping that address.

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• Translating Documents from a Foreign Language into English on my Computer?

  - by Simon

  I am aware that websites can be translated from many languages into English thanks to Google Translate. If I receive documentation via email that is in a language other than English, how straight forward is it to translate into English on my PC or Apple Mac? (indeed is Google Translate involved or is it strictly for websites) Similarly if I receive documentation via the normal postal mail service (termed "snail mail" if I'm correct) which needs to be translated into English, what steps need to be taken for this documentation to be translated effectively & quickly on my PC or Apple Mac (I am aware of the term Optical Character Recognition (OCR) software, and is this costly, or do free alternatives exist to carry out the translation process solely online? ).

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