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<H1>
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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 class='synopsistable'>
  <tr><td><b><tt class='module'><a href="module-md5.html" tppabs="http://www.python.org/doc/current/lib/module-md5.html">md5</a></tt></b></td>
      <td class='synopsis'>RSA's MD5 message digest algorithm.</td></tr>
  <tr><td><b><tt class='module'><a href="module-sha.html" tppabs="http://www.python.org/doc/current/lib/module-sha.html">sha</a></tt></b></td>
      <td class='synopsis'>NIST's secure hash algorithm, SHA.</td></tr>
  <tr><td><b><tt class='module'><a href="module-mpz.html" tppabs="http://www.python.org/doc/current/lib/module-mpz.html">mpz</a></tt></b></td>
      <td class='synopsis'>Interface to the GNU MP library for arbitrary
precision arithmetic.</td></tr>
  <tr><td><b><tt class='module'><a href="module-rotor.html" tppabs="http://www.python.org/doc/current/lib/module-rotor.html">rotor</a></tt></b></td>
      <td class='synopsis'>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
<a class="url" href="javascript:if(confirm('http://starship.python.net/crew/amk/python/code/crypto.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://starship.python.net/crew/amk/python/code/crypto.html'" tppabs="http://starship.python.net/crew/amk/python/code/crypto.html">http://starship.python.net/crew/amk/python/code/crypto.html <img src="offsite.gif" tppabs="http://www.python.org/doc/current/icons/offsite.gif"
  border='0' class='offsitelink' height='15' width='17' alt='[off-site link]'
  ></a> or
send email to <span class="email">amk1@bigfoot.com</span> for more information.


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