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