# 14 Cryptographic Services

The modules described in this chapter implement various algorithms of a cryptographic nature. They are available at the discretion of the installation. Here's an overview:

md5
  -- RSA's MD5 message digest algorithm.

mpz
  -- Interface to the GNU MP library for arbitrary precision arithmetic.

rotor
  -- Enigma-like encryption and decryption.

Hardcore cypherpunks will probably find the cryptographic modules written by Andrew Kuchling of further interest; the package adds built-in modules for DES and IDEA encryption, provides a Python module for reading and decrypting PGP files, and then some. These modules are not distributed with Python but available separately. See the URL ``http://www.magnet.com/ãmk/python/pct.html`' or send email to ``amk@magnet.com`' for more information.

- 14.1 Built-in Module `md5`
- 14.2 Built-in Module `mpz`
- 14.3 Built-in Module `rotor`