Ugarit is a backup/archival system based around content-addressible storage. This allows it to upload incremental backups to a remote server or a local filesystem such as an NFS share or a removable hard disk, yet have the system instantly able to produce a full snapshot on demand rather than needing to download a full snapshot plus all the incrementals since. The content-addressible storage technique means that the incrementals can be applied to a snapshot on various kinds of storage without needing intelligence in the storage itself - so the snapshots can live within Amazon S3 or on a removable hard disk. Similar to Plan 9's venti, but implemented in Chicken Scheme. Encrypting the backup store (called vault) is supported.

Interesting way to authenticate and encrypt HTTP without using SSL. Note the security concerns in some of the comments.

Encryption tool for data on external media (e.g. USB sticks) for Windows, Mac OS X and Linux.

Rant against C[++] compared to Modula-3 (german).

Web site offers a CAPTCHA test to distinguish between humans and robots. The results are used to correct texts from old books which were scanned.

Small SSH server and client.

An open access, peer-reviewed journal about information security.

On-line web server identification (fingerprint) tool.

This is the actual reconstructed image, the New Scientist artice showed the original instead.

A wiki with Information useful to competent Unix administrators and software developers. Includes a Lisp section, interesting tips such as using ssh with keychain, home directory under svn and more.