Hugh Daniel writes about converting used Telebit modems for crypto use:

Folks had been talking about doing some crypto things in custom hardware about the size of a Telebit. Telebits are just computers with ROM's in them and since Telebits are falling behind the tide of telecommunications I thought it might be nice to reporgram them as remote processers. The DSP's are quite fast and might give us very nice random numbers, the box has buffers and a CPU that can do flat out UUCP 'g' with compression so is likely more processer then most of the Fido systems out there currently. All around a nice box sitting there wasting, waiting to do something usefull.

Great idea! Figuring out how to rewire and reprogram a Telebit modem and then writing a port of PGP for it seems like a real service to the half-dozen or so people in the world who have these Telebits and who want what you describe. I hope my good friend Hugh is not angered by my mocking tone! A serious issue is economics, the allocation of scarce resources. Eric Hughes keeps pounding on this. A cheap RNG might be useful, but not for most people. And I can't imagine many people trying to scrounge old Telebits so as to get good random numbers (this assumes someone actually writes the RNG code, tests it for statistical properties, and submits it for "breaking" by others). More important is getting easy to use software out there. Modifying relatively scarce hardware (which Telbitw are, outside our circle of friends :-}) goes against this "populist crypto" philosophy. Zimmerman's really important contribution was to actually get RSA out to anyone with a PC or vanilla UNIX. Finally, why focus on the Telebit? I have an old Processor Technology "Sol" computer that could be similary reprogrammed for RNG use. Any takers? (Just kidding.) --Tim -- .......................................................................... Timothy C. May | Crypto Anarchy: encryption, digital money, tcmay@netcom.com | anonymous networks, digital pseudonyms, zero 408-688-5409 | knowledge, reputations, information markets, W.A.S.T.E.: Aptos, CA | black markets, collapse of governments. Higher Power: 2^756839 | PGP Public Key: awaiting Macintosh version. -- .......................................................................... Timothy C. May | Crypto Anarchy: encryption, digital money, tcmay@netcom.com | anonymous networks, digital pseudonyms, zero 408-688-5409 | knowledge, reputations, information markets, W.A.S.T.E.: Aptos, CA | black markets, collapse of governments. Higher Power: 2^756839 | PGP Public Key: awaiting Macintosh version.