Open Source C Security Software

The Sleuth Kit is a C++ library and collection of open source file system forensics tools that allow you to, among other things, view allocated and deleted data from NTFS, FAT, FFS, EXT2, Ext3, HFS+, and ISO9660 images.

Recursive computing and matching of Context Triggered Piecewise Hashing (aka Fuzzy Hashing). Supports Windows, *nix, BSD, OS X, etc.

DioNiSio is a DNS scanner written in ANSI C that only depends on sockets library and libc. It implements 3 scan methods (dictionary, massive reverse lookup and recursive zone transfers). Targeted to portability, rational resources usage, and easy use.

A large integer arithmetic library written in plain C.

SIPES (Security Incident Pollicy Enforcement System) aims to provide an automated e-mail,XML and PKI based system for automated security policy enforcement based on statefull risk assesment and open exchange formats.

MOTET is a tiny, fast super-encipherment application written in C, featuring the new CSPRNG/stream ciphers MOTE and BEDBUG in each of their three variants, as well as the "gold standard" among ciphers, ISAAC. MOTET brings multiple levels of encryption, including a ciphertext-hash, a Vigenere mixing function, a choice of Caesar MOD or Caesar MIX ciphering on the primary key-stream, plus a deeply scrambled "outer shell" as a final super-encryption stage. A unique nonce IV guarantees that each ciphertext will differ radically from every other, even on the same message and identical key.

Stegeek is very simple tool, that takes several files,encrypt, and mix them into one file. Also add some redundancy. The result is, that we have one archive and N keys. It should not be possible to guess N, if you have archive and up to N-1 keys.