Bastille Linux is a hardening script for various Linux operating systems, based on security advisories and good system-admin practice documents such as the Linux Administrator's Security Guide, Linux Step by Step and from organisations such as the SANS Institute. It's homepage is at: http://www.bastille-linux.org/ Cryptographic signatures and checksums may be provided by the developers at the URL(s) above. Wiretapped recommends that users check these before use of the software/information.