Cryptocat lets you instantly set up private conversations with some limitations. It's an open source encrypted alternative to other services. Messages are encrypted inside your own browser using AES-256. Encrypted data is securely wiped after one hour of inactivity.
RSA Schlüssel finden anhand von Ultraschall Signale, die von der CPU ausgestrahlt werden
Fast symmetric cryptography in Javascript
This is a brief walk-through of installing Ubuntu Hardy Heron (I used the release candidate, see the previous post) with a LUKS encrypted LVM partition, and preparing it for snapshot backup (explained below). You will need the “alternate†installer for this (ie. not the “desktop†Live CD).
Make long term backups of OpenPGP keys by printing only the secret bits on paper.
Implementation of sha1, md5 and md4 in JS