This thread seems to have a life of it's own.

I did complete the simple enigma in the AVR.  It will run in pretty much any
AVR.
First part loads the rotor settings and sprays a text message into ram.
Next part encrypts into ram below the plaintext
Next part resets the rotors
Finally, I decrypt into ram below the encrypted text.

Making bigger rotors would be nice, but not really necessary.
Each rotor costs you a byte per position, and AVR tables store 2 bytes/word
so without the reverse lookup table, it's a kbyte per four rotors if you
implemented a full byte-sized rotor.

I didn't do anything about serial or other interface, it's just a nice
little code module that runs with no hardware at all.


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Feel the power of the dark side!  Atmel AVR
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