Explained the basic ideas underlying cryptography. Discussed the Enigma
machine and an affine cryptosystem on single letter message units. <br>

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For more background on the Enigma machine take a look at the wikipedia
page <a href="http://en.wikipedia.org/wiki/Enigma_machine">here</a>. <br>
For more background on affine cryptosystems take a look at the
wikipedia page <a href="http://en.wikipedia.org/wiki/Affine_cipher">here</a>.

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See pages 68, 164, 178 of Lawson's book (available via Blackboard) for more on cryptography.