Crypto-dongle protocols?

[Matthew J Ghio]

> I know there was talk of making little crypto
> boxes that attach to the back of bigger computers.
> "Crypto-dongles," they were called.  Did anyone
> go and build one?  Did anyone think up a protocol
> for talking to one?
>
> It occurs to me that pocket computers like the
> Psion might make nice crypto-dongles, especially
> for people who use Unix for mail.  The little
> computer could show you the text you were
> signing or that it had decrypted.
> All safe from Unix hacks--but is there a good protocol?

This is being discussed on the hardware list, you might want to forward
this topic there instead.