Cryptography

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Python includes several modules for hashing and even basic ssl support which is integrated into the socket module.

For more serious cryptography work, have a look at the following extension modules.

Interfaces to OpenSSL

OpenSSL is an open-source library that implements SSL and comes with a large number of very fast crypto and hash algorithm implementations.

M2Crypto - Python interface to OpenSSL
pyOpenSSL - Python interface to OpenSSL, with focus on SSL networking
- eGenix pyOpenSSL Distribution - An easy-to-install distribution of pyOpenSSL

Stand-alone Cryptographic Libraries

Python Cryptography Toolkit - A collection of crypto-related algorithms and protocols implemented as Python extension

Resources

python-crypto Mailing List - A mailing list for discussing Python and cryptography