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Re: hohocon
For the hohocon case you could have a calculator programmed with
some one-way function (DES is available for the HP48); the remote
system could generate a challenge number and you would use your
calculator to DES-encrypt it with a fixed secret key, then type the
result in, and the remote system would check it.
In fact, that's exactly why I wrote it :-) .
Maybe I should go dig up the source to the challenge-response program
I wrote to go along with it..
- Bill