Hello all,
Cryptology has been an interest of mine for many years.
My Computer Science Masters Project in the mid 1970's was based around an Enigma Simulator programmed on a big old ICL System 4 machine (~ 150 sq m of floor space, punch card input, paper tape output, machine code, etc - probably less overall computing power than a PDA of today)
That was my first simulator, many, many more followed.
I can reccomend the following which gives a list of internet available software simulators:
http://www.xat.nl/enigma/
There is info on building your own machine, and a good book reference.
Try a simulator, give you hours of fun, send each other messages !
Regards,
Tony W