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\chapter{Cryptographic Services}
\index{cryptography}
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:
\begin{description}
\item[md5]
--- RSA's MD5 message digest algorithm.
\item[mpz]
--- Interface to the GNU MP library for arbitrary precision arithmetic.
\item[rotor]
--- Enigma-like encryption and decryption.
\end{description}
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
\url{http://www.magnet.com/\~amk/python/pct.html} or send email to
\email{amk@magnet.com} for more information.
\index{PGP}
\indexii{DES}{cipher}
\indexii{IDEA}{cipher}
\index{cryptography}
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