Category Archives: Cryptography

XORed

Posted on 26. Februar 2008 by jplasser

XORing plain text with a key is more fun than serious cryptography, particularly when you encrypt null values BTW, a really good tool for playing with cryptographic algorithms is CrypTool.

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A5/1 attacks

Posted on 25. Februar 2008 by jplasser

There’s some rumor on A5/1 attacks that work passive, cost effective (< 1,000$) and fast (about 30 minutes). Soon anybody will have the opportunity to listen to GSM phone calls … A5/1 is a (or should I say was?) GSM … Continue reading →

Posted in Cryptography, Security | 1 Comment

Cold boot beats disk encryption

Posted on 25. Februar 2008 by jplasser

This is interesting and it’s obvious that it works. One way to defeat this attack is to store cryptographics keys in a storage which loses all its content after power off. A hard problem. Cold boot disk encryption attack is … Continue reading →

Posted in Cryptography, Random, Security | 1 Comment

Hydan versteckt Nachrichten in Executables

Posted on 13. August 2004 by admin

Hydan steganographically conceals a message into an application. It exploits redundancy in the i386 instruction set by defining sets of functionally equivalent instructions. It then encodes information in machine code by using the appropriate instructions from each set. Hydan läßt … Continue reading →

Posted in Cryptography, Privacy, Security | Leave a comment