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  • Installing Debian 7.6.0 on Lenovo Y50

    - by Girauder
    I was trying to install Debian on my new laptop: a Lenovo Y50 64bit running Windows 8. I got together with a friend and installed Debian in his computer first and had no problems. However I've tried to install Debian several times using the AMD64 KDE and netinst versions and accomplished nothing. First try: installed the KDE version. Grub would let me choose which operating system I wanted, but when I selected Debian it would only load the command line. Second try: Reinstalled but this time with the netinst version. I only got a black screen where I could type but nothing else. Third Try. Tried the netinst again. This time after making the partitions I got a message that said that no EFI partition was found. I ignored the message and this time it wouldn't even load Grub. only a command like interface with grub rescue or something. Not once did I get an error during the installation. What am I doing wrong? I assume the problem is I need to make an EFI partition or something like that. So why is it that during the first installations I didn't ask me for that. And if that is indeed the problem, How can I solve it? Update So the installation failed again... as predicted. Here you can find the Disk Management picture. http://postimg.org/image/433cpfkjz/ Please somebody help me. I keep getting the grub rescue thing. secure boot is disabled and legacy support is set first.

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  • Objective-C library recommendation for AES-256 in CTR mode

    - by lpfavreau
    Hello, I'm looking for recommendations on an Objective-C library for AES-256 encryption in CTR mode. I have a database full of data encrypted with another library using CTR and seems the included CCCrypt only supports ECB or CBC with PKCS#7. Any idea on the best portable library I should use? I'm not looking to port the original implementation as I don't have the required knowledge in cryptography and hence, that's-a-bad-idea (tm). Thanks!

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  • Capture SOAP Envelope (C# WinForm calling .ASMX external vendor service)

    - by NealWalters
    I'm calling a third-party vendor's external SSL web service from a .NET 3.5 client (WinForm). The vendor has asked me to send them the Soap Header to verify why things aren't working. I used WireShark to capture packets, but since the web service is SSL, the packets are encrypted. Is there a few magic lines of code to add to my C# client to save or display the Soap Envelope either right before I call their web/method or right after?

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  • Session Id in url and/or cookie? [closed]

    - by Jacco
    Most people advice against rewriting every (internal) url to include the sessionId (both GET and POST). The standard argument against it seems to be:   If an attacker gets hold of the sessionId, they can hijack the session.   With the sessionId in the url, it easily leaks to the attacker (by referer etc.) But what if you put the sessionId in both an (encrypted) cookie and the url. if the sessionId in either the cookie or the url is missing or if they do not match, decline the request. Let's pretend the website in question is free of xss holes, the cookie encryption is strong enough, etc. etc. Then what is the increased risk of rewriting every url to include the sessionId? UPDATE: @Casper That is a very good point. so up to now there are 2 reasons: bad for search engines / SEO if used in public part of the website can cause trouble when users post an url with a session Id on a forum, send it trough email or bookmark the page apart from the:   It increases the security risk, but it is not clear what the increased risk is. some background info: I've a website that offers blog-like service to travellers. I cannot be sure cookies work nor can I require cookies to work. Most computers in internet cafes are old and not (even close to) up-to-date. The user has no control over them and the connection can be very unreliable for some more 'off the beaten path' locations. Binding the session to an IP-address is not possible, some places use load-balancing proxies with multiple IP addresses. (and from China there is The Great Firewall). Upon receiving the first cookie back, I flag cookies as mandatory. However, if the cookie was flagged as mandatory but not there, I ask for their password once more, knowing their session from the url. (Also cookies have a 1 time token in them, but that's not the point of this question). UPDATE 2: The conclusion seems to be that there are no extra *security* issues when you expose you session id trough the URL while also keeping a copy of the session id in an encrypted cookie. Do not hesitate to add additional information about any possible security implications

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  • How to create multiboot flash drive

    - by Nrew
    I've found a guide here: http://www.pendrivelinux.com/boot-multiple-iso-from-usb-multiboot-usb/ And found this menu.lst in my flash drive, which seems to be the one that I'm seeing when I boot using my flash drive: # This Menu Created by Lance http://www.pendrivelinux.com # Ongoing Suggested Menu Entries and the Suggestor are noted! default 0 timeout 30 color NORMAL HIGHLIGHT HELPTEXT HEADING splashimage=(hd0,0)/splash.xpm.gz foreground=FFFFFF background=0066FF title Memtest86+ find --set-root /memtest86+-4.00.iso map --mem /memtest86+-4.00.iso (hd32) map --hook root (hd32) chainloader (hd32) # Suggested by madprofessor title Boot Clonezilla root (hd0,0) kernel /clonezilla/live/vmlinuz live-media-path=clonezilla/live bootfrom=/dev/sd boot=live union=aufs noprompt ocs_live_run="ocs-live-general" ocs_live_extra_param="" ocs_live_keymap="" ocs_live_batch="no" ocs_lang="" vga=791 ip=frommedia initrd /clonezilla/live/initrd.img title Parted Magic 4.9 (Partition Tools) find --set-root /pmagic-4.9.iso map /pmagic-4.9.iso (hd32) map --hook root (hd32) chainloader (hd32) # Suggested by Deb title Partition Wizard 4.2 (Partition Tools) find --set-root /pwhe42.iso map /pwhe42.iso (hd32) map --hook root (hd32) chainloader (hd32) title Balder DOS image (FreeDOS) map --unsafe-boot /balder10.img (fd0) map --hook chainloader --force (fd0)+1 rootnoverify (fd0) # Suggested by Szymon Silski title Linux Mint 8 find --set-root /LinuxMint-8.iso map /LinuxMint-8.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/mint.seed boot=casper persistent iso-scan/filename=/LinuxMint-8.iso splash initrd /casper/initrd.lz title Ubuntu 10.04 find --set-root /ubuntu-10.04-desktop-i386.iso map /ubuntu-10.04-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper persistent iso-scan/filename=/ubuntu-10.04-desktop-i386.iso splash initrd /casper/initrd.lz title Xubuntu 10.04 (XFCE Desktop) find --set-root /xubuntu-10.04-desktop-i386.iso map /xubuntu-10.04-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper persistent iso-scan/filename=/xubuntu-10.04-desktop-i386.iso splash initrd /casper/initrd.lz title Kubuntu 10.04 (KDE Desktop) find --set-root /kubuntu-10.04-desktop-i386.iso map /kubuntu-10.04-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/kubuntu.seed boot=casper persistent iso-scan/filename=/kubuntu-10.04-desktop-i386.iso splash initrd /casper/initrd.lz # Suggested by Ambriel title Lubuntu 10.04 (LXDE Lightweight Desktop) find --set-root /lubuntu-10.04.iso map /lubuntu-10.04.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/lubuntu.seed boot=casper persistent iso-scan/filename=/lubuntu-10.04.iso splash initrd /casper/initrd.lz title Ubuntu 10.04 Netbook Remix (NetBook Distro) find --set-root /ubuntu-10.04-netbook-i386.iso map /ubuntu-10.04-netbook-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/netbook-remix.seed boot=casper persistent iso-scan/filename=/ubuntu-10.04-netbook-i386.iso splash initrd /casper/initrd.lz title Ubuntu 10.04 Server Edition Installer (32 bit Installer Only) find --set-root /ubuntu-10.04-server-i386.iso map /ubuntu-10.04-server-i386.iso (0xff) map --hook root (0xff) kernel /install/vmlinuz file=/cdrom/preseed/ubuntu-server.seed boot=install iso-scan/filename=/ubuntu-10.04-server-i386.iso splash initrd /install/initrd.gz title Ubuntu 9.10 find --set-root /ubuntu-9.10-desktop-i386.iso map /ubuntu-9.10-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper persistent iso-scan/filename=/ubuntu-9.10-desktop-i386.iso splash initrd /casper/initrd.lz title Xubuntu 9.10 find --set-root /xubuntu-9.10-desktop-i386.iso map /xubuntu-9.10-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper persistent iso-scan/filename=/xubuntu-9.10-desktop-i386.iso splash initrd /casper/initrd.lz title Kubuntu 9.10 find --set-root /kubuntu-9.10-desktop-i386.iso map /kubuntu-9.10-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/kubuntu.seed boot=casper persistent iso-scan/filename=/kubuntu-9.10-desktop-i386.iso splash initrd /casper/initrd.lz # Ubuntu Server and Netbook Remix suggested by Wojciech Holek title Ubuntu 9.10 Server Edition Installer (Installer Only) find --set-root /ubuntu-9.10-server-i386.iso map /ubuntu-9.10-server-i386.iso (0xff) map --hook root (0xff) kernel /install/vmlinuz file=/cdrom/preseed/ubuntu-server.seed boot=install iso-scan/filename=/ubuntu-9.10-server-i386.iso splash initrd /install/initrd.gz title Ubuntu 9.10 Netbook Remix (NetBook Distro) find --set-root /ubuntu-9.10-netbook-remix-i386.iso map /ubuntu-9.10-netbook-remix-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/netbook-remix.seed boot=casper persistent iso-scan/filename=/ubuntu-9.10-netbook-remix-i386.iso splash initrd /casper/initrd.lz title Ubuntu 9.10 Rescue Remix (Recovery Tools) find --set-root /ubuntu-rescue-remix-9-10-revision1.iso map /ubuntu-rescue-remix-9-10-revision1.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper iso-scan/filename=/ubuntu-rescue-remix-9-10-revision1.iso splash initrd /casper/initrd.lz title DSL 4.4.10 find --set-root /dsl-4.4.10-initrd.iso map --mem /dsl-4.4.10-initrd.iso (hd32) map --hook root (hd32) chainloader (hd32) title AVG Rescue CD (Anti-Virus + Anti-Spyware) find --set-root /avg_arl_en_90_100114.iso map /avg_arl_en_90_100114.iso (hd32) map --hook chainloader (hd32) title Ultimate Boot CD 4.11 find --set-root /ubcd411.iso map /ubcd411.iso (hd32) map --hook chainloader (hd32) title OphCrack XP 2.3.1 (XP Password Cracker) find --set-root /ophcrack-xp-livecd-2.3.1.iso map /ophcrack-xp-livecd-2.3.1.iso (0xff) map --hook root (0xff) kernel /boot/bzImage rw root=/dev/null vga=normal lang=C kmap=us screen=1024x768x16 autologin initrd /boot/rootfs.gz title OphCrack Vista 2.3.1 (Vista Password Cracker) find --set-root /ophcrack-vista-livecd-2.3.1.iso map /ophcrack-vista-livecd-2.3.1.iso (0xff) map --hook root (0xff) kernel /boot/bzImage rw root=/dev/null vga=normal lang=C kmap=us screen=1024x768x16 autologin initrd /boot/rootfs.gz # Suggested by Greg Steer title Offline NT Password & Registy Editor find --set-root /cd080802.iso map /cd080802.iso (hd32) map --hook chainloader (hd32) title SliTaz 2.0 find --set-root /slitaz-2.0.iso map --mem /slitaz-2.0.iso (hd32) map --hook chainloader (hd32) title Riplinux 9.3 find --set-root /RIPLinuX-9.3.iso map --heads=0 --sectors-per-track=0 /RIPLinuX-9.3.iso (0xff) || map --heads=0 --sectors-per-track=0 --mem /RIPLinuX-9.3.iso (0xff) map --hook chainloader (0xff) # Suggested by Sunny title YlmF (Windows Like OS) find --set-root /YlmF_OS_EN_v1.0.iso map /YlmF_OS_EN_v1.0.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper persistent iso-scan/filename=/YlmF_OS_EN_v1.0.iso splash initrd /casper/initrd.lz # Suggested by Martin Andersson title DBAN 1.0.7 (Drive Nuker) find --set-root /dban-1.0.7_i386.iso map --mem /dban-1.0.7_i386.iso (hd32) map --hook root (hd32) chainloader (hd32) # Suggested by Robin McGough title xPUD 0.9.2 (NetBook Distro) find --set-root --ignore-floppies --ignore-cd /xpud-0.9.2.iso map --heads=0 --sectors-per-track=0 /xpud-0.9.2.iso (hd32) map --hook chainloader (hd32) title Puppy 4.3.1 find --set-root /puppy/pup-431.sfs kernel /puppy/vmlinuz initrd /puppy/initrd.gz # Suggested by Relst title Run a Linux OS from the Internet kernel /gpxe.lkrn I also put some .iso files for os installers (Windows xp sp2 and Ubuntu 10.04) But they didn't show up in the list when I booted Do I need to: extract the .iso files and put in in their respective folders? Add the os that I added on the menu.lst? How do I add the iso image(os) in the menu.lst? Before adding the .iso files I first made a folder named Windows xp sp2 then placed the .iso files in there. Please help, I think I need to add the folder name or the file name on the menu.lst but I don't know how

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  • What couse this error?? Fatal error: Call to undefined function mcrypt_encrypt()

    - by Jin Yong
    Does Anyone know whcy this error message display (Call to undefined function mcrypt_encrypt() ) when I run the following code below? Am I missing some steps perhaps any setting in PHP I have to do before this code can work? $key = 'password to (en/de)crypt'; $string = 'string to be encrypted'; $test = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key)));

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  • Users Login Info in INFORMIX-SQL

    - by Frank Developer
    INFORMIX-SQL 4.1 - There's this ASCII UNIX file called "passwd" in /usr/informix/etc which holds all the user id's and encrypted passwords to log into ISQL. Is there a system catalog table which holds the logged in users? I see a SYSUSERS.DAT file but when I queried it, it didnt show my login id, date or time.

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  • use bouncy castle libraries to encrypt files using public key from digital certificate

    - by mike
    I got the public key from the certificate, keypair is a java.security.KeyPair object String public_key = keypair.getPublic().toString(); I want to send this to the via an http connection to a J2me application. I cannot find any documentation to convert the transmitted string to a Public key that can be used to encrypt Strings. I also want the J2me to verify signed strings from the server. I want to then send the encrypted strings back to the server.

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  • How to overwrite the data in a file with bash

    - by Stefan Liebenberg
    I'm writing a bash script that encrypts the data of a folder or file #!/bin/bash file_name=$1 tmp_file=/tmp/tmpfile.tar # tar compress file tar -cf $tmp_file $file_name; # encrypt file gpg -c $tmp_file # remove temp file rm -rf $tmp_file $file_name # mv encrypted file to orignal place mv ${tmp_file}.gpg $file_name but the data will still be recoverable by using photorec or similar methods... Is there a way to ensure the absolute deletion of the original file in bash? Thank You Stefan

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  • Single Sign on- From our customer's Active Directory

    - by jbarker7
    We have an ASP.NET MVC website that a customer is requesting Active Directory single sign on. My thought is that we will need something behind their firewall in order to send encrypted credentials or a user's ID over to our server... any best practices or products that do this would be extremely helpful! Thanks! jbarker7

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  • Whats wrong with my triple DES wrapper??

    - by Chen Kinnrot
    it seems that my code adds 6 bytes to the result file after encrypt decrypt is called.. i tries it on a mkv file.. please help here is my code class TripleDESCryptoService : IEncryptor, IDecryptor { public void Encrypt(string inputFileName, string outputFileName, string key) { EncryptFile(inputFileName, outputFileName, key); } public void Decrypt(string inputFileName, string outputFileName, string key) { DecryptFile(inputFileName, outputFileName, key); } static void EncryptFile(string inputFileName, string outputFileName, string sKey) { var outFile = new FileStream(outputFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite); // The chryptographic service provider we're going to use var cryptoAlgorithm = new TripleDESCryptoServiceProvider(); SetKeys(cryptoAlgorithm, sKey); // This object links data streams to cryptographic values var cryptoStream = new CryptoStream(outFile, cryptoAlgorithm.CreateEncryptor(), CryptoStreamMode.Write); // This stream writer will write the new file var encryptionStream = new BinaryWriter(cryptoStream); // This stream reader will read the file to encrypt var inFile = new FileStream(inputFileName, FileMode.Open, FileAccess.Read); var readwe = new BinaryReader(inFile); // Loop through the file to encrypt, line by line var date = readwe.ReadBytes((int)readwe.BaseStream.Length); // Write to the encryption stream encryptionStream.Write(date); // Wrap things up inFile.Close(); encryptionStream.Flush(); encryptionStream.Close(); } private static void SetKeys(SymmetricAlgorithm algorithm, string key) { var keyAsBytes = Encoding.ASCII.GetBytes(key); algorithm.IV = keyAsBytes.Take(algorithm.IV.Length).ToArray(); algorithm.Key = keyAsBytes.Take(algorithm.Key.Length).ToArray(); } static void DecryptFile(string inputFilename, string outputFilename, string sKey) { // The encrypted file var inFile = File.OpenRead(inputFilename); // The decrypted file var outFile = new FileStream(outputFilename, FileMode.OpenOrCreate, FileAccess.ReadWrite); // Prepare the encryption algorithm and read the key from the key file var cryptAlgorithm = new TripleDESCryptoServiceProvider(); SetKeys(cryptAlgorithm, sKey); // The cryptographic stream takes in the encrypted file var encryptionStream = new CryptoStream(inFile, cryptAlgorithm.CreateDecryptor(), CryptoStreamMode.Read); // Write the new unecrypted file var cleanStreamReader = new BinaryReader(encryptionStream); var cleanStreamWriter = new BinaryWriter(outFile); cleanStreamWriter.Write(cleanStreamReader.ReadBytes((int)inFile.Length)); cleanStreamWriter.Close(); outFile.Close(); cleanStreamReader.Close(); } }

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  • What causes this error? Fatal error: Call to undefined function mcrypt_encrypt()

    - by Jin Yong
    Does anyone know why this error message: (Call to undefined function mcrypt_encrypt() ) displays when I run the following code below? Am I missing some steps perhaps any setting in PHP I have to do before this code can work? $key = 'password to (en/de)crypt'; $string = 'string to be encrypted'; $test = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key)));

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  • decrypt excel files

    - by locojay
    Hi I have 1000 encrypted workbooks which I would like to decrypt by providing a pwd. I could not find a decrypt method under apache poi or python's xlrd module. Does anyone know a library which could handle this (wbc.decrypt(pwd)). I would prefer a lib i could you use from a unix box. Thanks

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  • Problem installing Ubuntu 10.04 64 bit side by side with Vista by using a bootable USB drive. What n

    - by Adam Siddhi
    What happened I decided to install Ubuntu 10.04 64 bit side by side with Vista Home Premium (I guess on another partition) with a USB stick. I found instructions on how to do this here: https://help.ubuntu.com/community/Installation/FromUSBStick To create the bootable USB drive I had to download a program called Unetbootin. That process was simple enough. All I had to do was just choose the disk image option, select the ubuntu-10.04-desktop-amd64.iso image, make sure it recognizes my USB drive and then press OK. It takes only like a few minutes to create a working bootable USB drive. Then I have to restart my computer, enter the BIOS, select my USB drive as the first boot drive, save options and continue with booting up. After this Ubuntu actually loads up. I think this is known as the Live version of Ubuntu so you can try it out before fully installing it. Any ways, on the Ubuntu 10.04 desktop I saw an installer. I click it and begin the installation process. Just so you know, I tried installing it 2 times. I will explain what happened each time: The first time I tried installing Ubuntu 10.04 I got stuck at step 4 of 7. I remember selecting the last option in the window which was Specify Partitions Manually (Advanced) I made my partition for Ubuntu like 52 gigs. I clicked forward and a little pop up window appeared saying Please Wait. So the installation process stalled on this window so I closed out of it and quit the installation process. So at this point I was worried because I had already selected the partition size and assumed it started making it. Since it stalled I had to quit out though. Anyways, once again I reached step 4 of 7 a decided to select the first option which is Install them side by side choosing between them each startup. I figured this was the safe way to go. I did that and the pop up window saying Please Wait popped up again but lasted only like 10 seconds. Then I got to I guess step 6 where it asks you to enter your desired name and password. Did that and clicked forward. The Ubuntu 10.04 installation load screen appeared and the loading bar at the bottom started filling up. So I got to 83% and stalled during the Importing other profile information (I think it was called this. I had the option to do this during I think step 6) process. So at this point I decided to get stop the installation process. I was getting very nervous. I tried to restart the computer but all that happened was that Ubuntu restarted. I finally got the computer to restart. I was pretty sure I had screwed something up big time by this point. As my computer was restarting I entered BIOS again and switched back to it booting from my main hard drive containing Vista. Saved it and continued the boot process. My worst fears were confirmed as Vista would not boot up. I mean I saw the little Microsoft Windows choppy animated green loading bar at the bottom of the screen and then boom! It decided to restart. When it restarted I had the option to run a memory test check to see if there was anything that needed to be repaired. That took like 20 minutes and at the end I saw that I did indeed have to repair something. I had to go through 2 repair processes. After each I had to restart the computer. The 2nd time it went through the repair process it said that it could not fully repair the damage. I was scared and restarted but Vista did load up. I got to my desktop and saw a message saying something like Repairs have been made, Please restart for changes to take effect I noticed that some Notification icons were missing and I could not hear volume in a video. Things were a bit funky. So I did restart and here I am. Now what?! So since I got back into Vista and thankfully have a working Internet connection I am trying to find answers to my problem (that is why I am writing this post). I am scared that I have partioned my hard drive 2 times after researching Installing Ubuntu 10.04 and seeing this post http://techie-buzz.com/foss/ubuntu-10-04-lts-installation-guide.html The author shows screen shots of installing Ubuntu 10.04. He shows the image of step 4 of 7 with a caption at the bottom. I will recreate it below: Select a partitioning option. Unless you want to format all the hard drive and install Ubuntu afresh, select the last option and proceed. Questions If I have indeed partitioned my HD 2 times (which I am sure it is), how do I get to a point where I can see all my bad, unfinished Ubuntu partitions and get rid of them? How do I clean this big mess up? & How can I ensure that this mess will not happen next time I try installing Ubuntu 10.04? Thank you Adam

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  • Is ASP.Net State Server an elegant solution?

    - by alchemical
    We have an ASP.Net MVC project that will start with a single web server but likely soon scale into a small web farm. As ASP.Net Authentication stores a UserID, and data caching may also be useful, we would likely need to make the jump to state server fairly soon. I'd like to hear from others how State Server has been to work with and how it scales from a performance perspective. Alternateively, we could architect it as completely stateless by not using data caching and tracking sessions with an encrypted cookie.

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  • Steganography : Encoded audio and video file not being played, getting corrupted. What is the issue

    - by Shantanu Gupta
    I have made a steganography program to encrypt/Decrypt some text under image audio and video. I used image as bmp(54 byte header) file, audio as wav(44 byte header) file and video as avi(56 byte header) file formats. When I tries to encrypt text under all these file then it gets encrypted successfully and are also getting decrypted correctly. But it is creating a problem with audio and video i.e these files are not being played after encrypted result. What can be the problem. I am working on Turbo C++ compiler. I know it is super outdated compiler but I have to do it in this only. Here is my code to encrypt. int Binary_encode(char *txtSourceFileName, char *binarySourceFileName, char *binaryTargetFileName,const short headerSize) { long BinarySourceSize=0,TextSourceSize=0; char *Buffer; long BlockSize=10240, i=0; ifstream ReadTxt, ReadBinary; //reads ReadTxt.open(txtSourceFileName,ios::binary|ios::in);//file name, mode of open, here input mode i.e. read only if(!ReadTxt) { cprintf("\nFile can not be opened."); return 0; } ReadBinary.open(binarySourceFileName,ios::binary|ios::in);//file name, mode of open, here input mode i.e. read only if(!ReadBinary) { ReadTxt.close();//closing opened file cprintf("\nFile can not be opened."); return 0; } ReadBinary.seekg(0,ios::end);//setting pointer to a file at the end of file. ReadTxt.seekg(0,ios::end); BinarySourceSize=(long )ReadBinary.tellg(); //returns the position of pointer TextSourceSize=(long )ReadTxt.tellg(); //returns the position of pointer ReadBinary.seekg(0,ios::beg); //sets the pointer to the begining of file ReadTxt.seekg(0,ios::beg); //sets the pointer to the begining of file if(BinarySourceSize<TextSourceSize*50) //Minimum size of an image should be 50 times the size of file to be encrypted { cout<<"\n\n"; cprintf("Binary File size should be bigger than text file size."); ReadBinary.close(); ReadTxt.close(); return 0; } cout<<"\n"; cprintf("\n\nSize of Source Image/Audio File is : "); cout<<(float)BinarySourceSize/1024; cprintf("KB"); cout<<"\n"; cprintf("Size of Text File is "); cout<<TextSourceSize; cprintf(" Bytes"); cout<<"\n"; getch(); //write header to file without changing else file will not open //bmp image's header size is 53 bytes Buffer=new char[headerSize]; ofstream WriteBinary; // writes to file WriteBinary.open(binaryTargetFileName,ios::binary|ios::out|ios::trunc);//file will be created or truncated if already exists ReadBinary.read(Buffer,headerSize);//reads no of bytes and stores them into mem, size contains no of bytes in a file WriteBinary.write(Buffer,headerSize);//writes header to 2nd image delete[] Buffer;//deallocate memory /* Buffer = new char[sizeof(long)]; Buffer = (char *)(&TextSourceSize); cout<<Buffer; */ WriteBinary.write((char *)(&TextSourceSize),sizeof(long)); //writes no of byte to be written in image immediate after header ends //to decrypt file if(!(Buffer=new char[TextSourceSize])) { cprintf("Enough Memory could not be assigned."); return 0; } ReadTxt.read(Buffer,TextSourceSize);//read all data from text file ReadTxt.close();//file no more needed WriteBinary.write(Buffer,TextSourceSize);//writes all text file data into image delete[] Buffer;//deallocate memory //replace Tsize+1 below with Tsize and run the program to see the change //this is due to the reason that 50-54 byte no are of colors which we will be changing ReadBinary.seekg(TextSourceSize+1,ios::cur);//move pointer to the location-current loc i.e. 53+content of text file //write remaining image content to image file while(i<BinarySourceSize-headerSize-TextSourceSize+1) { i=i+BlockSize; Buffer=new char[BlockSize]; ReadBinary.read(Buffer,BlockSize);//reads no of bytes and stores them into mem, size contains no of bytes in a file WriteBinary.write(Buffer,BlockSize); delete[] Buffer; //clear memory, else program can fail giving correct output } ReadBinary.close(); WriteBinary.close(); //Encoding Completed return 0; } Code to decrypt int Binary_decode(char *binarySourceFileName, char *txtTargetFileName, const short headerSize) { long TextDestinationSize=0; char *Buffer; long BlockSize=10240; ifstream ReadBinary; ofstream WriteText; ReadBinary.open(binarySourceFileName,ios::binary|ios::in);//file will be appended if(!ReadBinary) { cprintf("File can not be opened"); return 0; } ReadBinary.seekg(headerSize,ios::beg); Buffer=new char[4]; ReadBinary.read(Buffer,4); TextDestinationSize=*((long *)Buffer); delete[] Buffer; cout<<"\n\n"; cprintf("Size of the File that will be created is : "); cout<<TextDestinationSize; cprintf(" Bytes"); cout<<"\n\n"; sleep(1); WriteText.open(txtTargetFileName,ios::binary|ios::out|ios::trunc);//file will be created if not exists else truncate its data while(TextDestinationSize>0) { if(TextDestinationSize<BlockSize) BlockSize=TextDestinationSize; Buffer= new char[BlockSize]; ReadBinary.read(Buffer,BlockSize); WriteText.write(Buffer,BlockSize); delete[] Buffer; TextDestinationSize=TextDestinationSize-BlockSize; } ReadBinary.close(); WriteText.close(); return 0; } int text_encode(char *SourcefileName, char *DestinationfileName) { ifstream fr; //reads ofstream fw; // writes to file char c; int random; clrscr(); fr.open(SourcefileName,ios::binary);//file name, mode of open, here input mode i.e. read only if(!fr) { cprintf("File can not be opened."); getch(); return 0; } fw.open(DestinationfileName,ios::binary|ios::out|ios::trunc);//file will be created or truncated if already exists while(fr) { int i; while(fr!=0) { fr.get(c); //reads a character from file and increments its pointer char ch; ch=c; ch=ch+1; fw<<ch; //appends character in c to a file } } fr.close(); fw.close(); return 0; } int text_decode(char *SourcefileName, char *DestinationName) { ifstream fr; //reads ofstream fw; // wrrites to file char c; int random; clrscr(); fr.open(SourcefileName,ios::binary);//file name, mode of open, here input mode i.e. read only if(!fr) { cprintf("File can not be opened."); return 0; } fw.open(DestinationName,ios::binary|ios::out|ios::trunc);//file will be created or truncated if already exists while(fr) { int i; while(fr!=0) { fr.get(c); //reads a character from file and increments its pointer char ch; ch=c; ch=ch-1; fw<<ch; //appends character in c to a file } } fr.close(); fw.close(); return 0; }

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  • Facing Memory Leaks in AES Encryption Method.

    - by Mubashar Ahmad
    Can anyone please identify is there any possible memory leaks in following code. I have tried with .Net Memory Profiler and it says "CreateEncryptor" and some other functions are leaving unmanaged memory leaks as I have confirmed this using Performance Monitors. but there are already dispose, clear, close calls are placed wherever possible please advise me accordingly. its a been urgent. public static string Encrypt(string plainText, string key) { //Set up the encryption objects byte[] encryptedBytes = null; using (AesCryptoServiceProvider acsp = GetProvider(Encoding.UTF8.GetBytes(key))) { byte[] sourceBytes = Encoding.UTF8.GetBytes(plainText); using (ICryptoTransform ictE = acsp.CreateEncryptor()) { //Set up stream to contain the encryption using (MemoryStream msS = new MemoryStream()) { //Perform the encrpytion, storing output into the stream using (CryptoStream csS = new CryptoStream(msS, ictE, CryptoStreamMode.Write)) { csS.Write(sourceBytes, 0, sourceBytes.Length); csS.FlushFinalBlock(); //sourceBytes are now encrypted as an array of secure bytes encryptedBytes = msS.ToArray(); //.ToArray() is important, don't mess with the buffer csS.Close(); } msS.Close(); } } acsp.Clear(); } //return the encrypted bytes as a BASE64 encoded string return Convert.ToBase64String(encryptedBytes); } private static AesCryptoServiceProvider GetProvider(byte[] key) { AesCryptoServiceProvider result = new AesCryptoServiceProvider(); result.BlockSize = 128; result.KeySize = 256; result.Mode = CipherMode.CBC; result.Padding = PaddingMode.PKCS7; result.GenerateIV(); result.IV = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; byte[] RealKey = GetKey(key, result); result.Key = RealKey; // result.IV = RealKey; return result; } private static byte[] GetKey(byte[] suggestedKey, SymmetricAlgorithm p) { byte[] kRaw = suggestedKey; List<byte> kList = new List<byte>(); for (int i = 0; i < p.LegalKeySizes[0].MaxSize; i += 8) { kList.Add(kRaw[(i / 8) % kRaw.Length]); } byte[] k = kList.ToArray(); return k; }

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  • Java Encryption issue

    - by r1k0
    I am using PBE encryption to encrypt and decrypt some text on an Android application but I get the BadPaddingException: with the "pad block corrupted" message when I use the wrong private key to decrypt the text. My question, since I am not well versed with encryption in Java, is if this is the normal behavior of the encryption API, because I need to do some logic in the case when the wrong key is entered, but I do not know the private key, nor do I store it anywhere (storing just the encrypted and decrypted check text). Thanks, Mihai

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  • Recover RAID 5 data after created new array instead of re-using

    - by Brigadieren
    Folks please help - I am a newb with a major headache at hand (perfect storm situation). I have a 3 1tb hdd on my ubuntu 11.04 configured as software raid 5. The data had been copied weekly onto another separate off the computer hard drive until that completely failed and was thrown away. A few days back we had a power outage and after rebooting my box wouldn't mount the raid. In my infinite wisdom I entered mdadm --create -f... command instead of mdadm --assemble and didn't notice the travesty that I had done until after. It started the array degraded and proceeded with building and syncing it which took ~10 hours. After I was back I saw that that the array is successfully up and running but the raid is not I mean the individual drives are partitioned (partition type f8 ) but the md0 device is not. Realizing in horror what I have done I am trying to find some solutions. I just pray that --create didn't overwrite entire content of the hard driver. Could someone PLEASE help me out with this - the data that's on the drive is very important and unique ~10 years of photos, docs, etc. Is it possible that by specifying the participating hard drives in wrong order can make mdadm overwrite them? when I do mdadm --examine --scan I get something like ARRAY /dev/md/0 metadata=1.2 UUID=f1b4084a:720b5712:6d03b9e9:43afe51b name=<hostname>:0 Interestingly enough name used to be 'raid' and not the host hame with :0 appended. Here is the 'sanitized' config entries: DEVICE /dev/sdf1 /dev/sde1 /dev/sdd1 CREATE owner=root group=disk mode=0660 auto=yes HOMEHOST <system> MAILADDR root ARRAY /dev/md0 metadata=1.2 name=tanserv:0 UUID=f1b4084a:720b5712:6d03b9e9:43afe51b Here is the output from mdstat cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sdd1[0] sdf1[3] sde1[1] 1953517568 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU] unused devices: <none> fdisk shows the following: fdisk -l Disk /dev/sda: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000bf62e Device Boot Start End Blocks Id System /dev/sda1 * 1 9443 75846656 83 Linux /dev/sda2 9443 9730 2301953 5 Extended /dev/sda5 9443 9730 2301952 82 Linux swap / Solaris Disk /dev/sdb: 750.2 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000de8dd Device Boot Start End Blocks Id System /dev/sdb1 1 91201 732572001 8e Linux LVM Disk /dev/sdc: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00056a17 Device Boot Start End Blocks Id System /dev/sdc1 1 60801 488384001 8e Linux LVM Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000ca948 Device Boot Start End Blocks Id System /dev/sdd1 1 121601 976760001 fd Linux raid autodetect Disk /dev/dm-0: 1250.3 GB, 1250254913536 bytes 255 heads, 63 sectors/track, 152001 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/dm-0 doesn't contain a valid partition table Disk /dev/sde: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x93a66687 Device Boot Start End Blocks Id System /dev/sde1 1 121601 976760001 fd Linux raid autodetect Disk /dev/sdf: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xe6edc059 Device Boot Start End Blocks Id System /dev/sdf1 1 121601 976760001 fd Linux raid autodetect Disk /dev/md0: 2000.4 GB, 2000401989632 bytes 2 heads, 4 sectors/track, 488379392 cylinders Units = cylinders of 8 * 512 = 4096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 524288 bytes / 1048576 bytes Disk identifier: 0x00000000 Disk /dev/md0 doesn't contain a valid partition table Per suggestions I did clean up the superblocks and re-created the array with --assume-clean option but with no luck at all. Is there any tool that will help me to revive at least some of the data? Can someone tell me what and how the mdadm --create does when syncs to destroy the data so I can write a tool to un-do whatever was done? After the re-creating of the raid I run fsck.ext4 /dev/md0 and here is the output root@tanserv:/etc/mdadm# fsck.ext4 /dev/md0 e2fsck 1.41.14 (22-Dec-2010) fsck.ext4: Superblock invalid, trying backup blocks... fsck.ext4: Bad magic number in super-block while trying to open /dev/md0 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 Per Shanes' suggestion I tried root@tanserv:/home/mushegh# mkfs.ext4 -n /dev/md0 mke2fs 1.41.14 (22-Dec-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=128 blocks, Stripe width=256 blocks 122101760 inodes, 488379392 blocks 24418969 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=0 14905 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848 and run fsck.ext4 with every backup block but all returned the following: root@tanserv:/home/mushegh# fsck.ext4 -b 214990848 /dev/md0 e2fsck 1.41.14 (22-Dec-2010) fsck.ext4: Invalid argument while trying to open /dev/md0 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> Any suggestions? Regards!

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  • Javascript to encode cookie contents into a get or post?

    - by beeky
    I want to pass cookie contents from one domain to another. I don't want to get involved with actual cross-domain cookies. I was thinking of reading the cookie on the domain that sets it and then sending it as an encrypted JSON object to the domain that wants to use it. Is there an accepted way of doing this and/or a toolkit that handles this sort of thing? Thanks for any help or advice, -=b

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