GNU Privacy Guard
OpenPGP (RFC2440) implementation from the GNU project. Encrypts/decrypts/signs/digests files using strong cryptography. FAQ, downloads, documentation.
North American Cryptography Archives
Strong cryptographic software, libraries, and information about cryptography, data security, and privacy.
OpenSSH - Portable Distribution
Open source implementation of SSH1 and SSH2 protocols. Ported from OpenBSD by the OpenSSH portability team.
Postfix Mail Transfer Agent
Drop-in Sendmail replacement by Wietse Venema. Offers several features that make it difficult to crack.
sudoscript
A pair of Perl scripts that provide an audited root shell using sudo and script(1). Tarballs, RPM's and individual components.
The Coroner's Toolkit (TCT)
The Coroner's Toolkit (TCT) provides post-break-in data collection that could be useful in determining what happened. Less polished that the authors (Dan Farmer and Wietse Vene…
Tripwire Open Source
Open source version of the original Unix file integrity scanner. Calculates and stores signatures of file permissions, ownership and contents. Scans the same files later, detecting…
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