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Sharp Wizard as a Crypto Dongle?
I had the same idea, only with an HP48SX (I work for HP); the 48 is a
little pricier, but cheaper than say the 95LX or similar pocket PC's.
(I got as far as a DES implementation in user RPL -- I "ported" the
Ferguson DES in a day or so; I haven't gotten around to slogging
through converting it into system RPL or machine code).
Progammable consumer products would be pretty good as *prototypes*,
but not good enough for "production" use in the presence of a
determined attacker due to lack of tamper-resistance.
[my apologies if this came up before; I'm new to the list].