How to roll over/transition your 1024 bit DSA keys which are no longer secure to something better using either Thunderbird with Enigmail or GnuPG (GPG) command line interface
Infos rund um Verschlüsselungsmethoden
Secure Authentification via USBStick
An article about secure authentication systems has recently been released in the hakin9 print magazine, also covering USBAuth, which has been renewed and now also supports additional PIN-based hashed authentication for even more security.