OpenPGP (RFC2440) implementation from the GNU project. Encrypts/decrypts/signs/digests files using strong cryptography. FAQ, downloads, documentation.
Drop-in Sendmail replacement by Wietse Venema. Offers several features that make it difficult to crack.
Commercial version of the original Unix file integrity scanner. Calculates and stores signatures of file permissions, ownership and contents. Scans the same files later, detecting changes.
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 changes. This open source version is targeted at Linux systems.
Efficient stealth port scanner. Downloads, e-mail lists, news.
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 Venema) usual work, the toolkit offers a patch-work of tools that help exhume interesting stuff from violated systems. Should be installed and examined before a break-in happens!
lsof is a tool for examining I/O channels open on your Unix system. These can include files, FIFOs and network sockets. This information can be extremely useful for security and a variety of other purposes. Works on most Unix-like systems.
SUS is a utility to allow a user (typically a system administrator) to run a single command as the super user.
Execute root-level commands and shell scripts without having to actually login as root. Control which users can log in and under which circumstances.
Allows improved monitoring and alerting based on the contents of system logs.
Computers /
Software /
Operating_Systems /
Unix /
Administration
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