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copied!<p>If what you mean is that you want to roll your own encryption system, you could try using the built-in <code>hmac</code> and <code>hashlib</code> modules. (<code>hashlib</code> is new for 2.5, so if you must use an earlier Python, your hash choices are the older <code>md5</code> and <code>sha</code> modules.)</p> <p>If you are opposed to (or are prevented from) <em>installing</em> a third-party library but are OK with using third-party algorithms or even "lightweight" third-party implementations of algorithms (e.g. published Python source code which resides in a single .py file that you can incorporate or import yourself without using <code>setup.py</code> or any other <em>formal</em> installation), then I highly recommend you do so, because these are likely to be better than what you can come up with on your own.</p> <p>The smallest and user-friendliest of these that I am aware of is known as <strong>p3</strong>, written by cryptographer Paul Rubin. The original link is no longer active but you can search for it. Googling currently yields <a href="https://github.com/zhangchunlin/gitldapacl/blob/master/p3.py" rel="nofollow noreferrer">a near-exact copy</a> as well as <a href="https://sourceforge.net/p/treeline/devel/ci/default/tree/source/p3.py" rel="nofollow noreferrer">an adaptation for Python 3</a>.</p> <p>You could also try one of several single-module, pure-Python <a href="https://en.wikipedia.org/wiki/Advanced_Encryption_Standard" rel="nofollow noreferrer">Rijndael (AES)</a> implementations such as <a href="http://fastcrypto.org/umac/2004/src/rijndael.py" rel="nofollow noreferrer">this</a> or <a href="http://www.bjrn.se/code/rijndaelpy.txt" rel="nofollow noreferrer">this</a>. (Again, links are not guaranteed to be permanent so you may have to do some searching.)</p>

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