C12G12 is a finalised branch of Caesarion v12; a free, open-source (C++) software product for the DragonFlyBSD , FreeBSD , OpenBSD and Linux operating systems.

Since the source code is mostly ANSI/ISO/POSIX standards compliant, it should also compile and run without problem on the NetBSD operating system.

C12G12 is distributed under a software license which mandates that it may not be used for terrorism, paedophilia or crimes against humanity.

The software provides secure (E-mail) communications facilities; communications secrecy, user-authentication and data-integrity verification.
The software also provides file encryption/decryption facilities.

C12G12 provides some unique technological superiorities, including:

• The use of the L15 CSPRNG.
• Innovative Cipher-Packet technique hides ciphertext in random padding, thus preventing cryptanalysis.
• The software is supplied with file encryption utilities which utilise the above facilities.
• E-mail is encrypted using the RSA public-key cryptosystem thus eliminating security risks from symmetric ciphers.
• The provision of secret-public-key facilities caters for high security scenarios.
• Unorthodox (reversed) RSA encoding of data/salt should provide a higher level of security relative to orthodox implementations.
• Digital signatures are encrypted thus eliminating security risks from cryptographic hash functions (most of which have recently discovered security issues).
• The software is supplied with a FreeBSD-4.11R /dev/[u]random replacement kit.
• The software is supplied with complete documentation including manual pages.