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.

Posted in Cryptography No Comments »

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 encryption standard.

Posted in Cryptography, Security 1 Comment »

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 shockingly effective - Engadget

Schneier on Security: Cold Boot Attacks Against Disk Encryption
Center for Information Technology Policy [...]

Posted in Cryptography, Random, Security 1 Comment »

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 sich verwenden um
1. Geheim Botschaften auszutauschen,
2. Binaries zu signieren (Authentizitätsprüfung), und
[...]

Posted in Cryptography, Privacy, Security No Comments »