"Stephen J. Rush" wrote in message
news

I can't find any hint of how the American cryptanalysts were able to
break Purple and the more important Japanese naval code with only
cyphertext to work with. Remember, Bletchley Park had Enigma machines.

Some of those articles say that the key was learning that it used phone
stepping switches. That must have given away the modulus number or
something like that. The switches also were not removeable like enigma
rotors.


--

Reply in group, but if emailing add another
zero, and remove the last word.