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<H1><A NAME="SECTION0017000000000000000000"></A>
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15. Cryptographic Services
</H1>

<P>
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:

<P>
<table>
  <tr><td><b><tt><a href="module-md5.html">md5</a></tt></b></td>
      <td>RSA's MD5 message digest algorithm.</td></tr>
  <tr><td><b><tt><a href="module-sha.html">sha</a></tt></b></td>
      <td>NIST's secure hash algorithm, SHA.</td></tr>
  <tr><td><b><tt><a href="module-mpz.html">mpz</a></tt></b></td>
      <td>Interface to the GNU MP library for arbitrary
precision arithmetic.</td></tr>
  <tr><td><b><tt><a href="module-rotor.html">rotor</a></tt></b></td>
      <td>Enigma-like encryption and decryption.</td></tr>
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<BR>

<P>
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
<span class=url><a href="http://starship.python.net/crew/amk/python/crypto.html">http://starship.python.net/crew/amk/python/crypto.html</a></span> or
send email to <span class=email>akuchlin@acm.org</span> for more information.
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