> But for what started this thread, I do wonder if a dongle containing an
> 18F or 30F PIC doing a calculation on the data may well be a viable
> way of doing things

That's what I was thinking. DES3 may be overkill, perhaps TEA ?

http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm

Or whatever. Any form of dynamic and ongoing encryption would
surely deter many hackers, and the PIC itself is reasonably physically
secure

That doesn't address Herbert's concerns of course


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