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- Path: sparky!uunet!mcsun!uknet!mucs!nessie!nessie!segr
- From: segr@nessie.mcc.ac.uk (Simon Read)
- Newsgroups: sci.crypt
- Subject: Cheap RSA chips? (Was: Re: shift registers??)
- Message-ID: <1992Aug20.160528.2155@nessie.mcc.ac.uk>
- Date: 20 Aug 92 16:05:28 GMT
- References: <1992Aug19.864.126@ALMAC>
- Sender: segr@nessie (Simon Read)
- Distribution: sci
- Organization: Manchester Computing Centre
- Lines: 38
-
- In article <1992Aug19.864.126@ALMAC>, keith.willis@almac.co.uk
- writes:
-
- > You mean that one could implement RSA in hardware for a
- > reasonably low price? And would such a device still infringe
- > the patents (in the US), or do they only cover software
- > implementations?
-
- Chips that "do RSA" are in fact no more than modular
- multiplication chips (they perform the calculation C=(M**E) mod N,
- for C M E and N very large numbers, typically 512 or 1024 bits).
-
- This can be done quite cheaply. Philips designed but never sold a
- smart card to do it, I've been involved in another project to do
- it, and some companies integrate such chips into their machines.
- They are cheap but slow, faster than a S/W implementation though.
-
- I can't see how Rivest Shamir and Adleman can have a patent on
- performing exponentiation (patents cannot cover maths). They can
- patent a way of doing it on a chip (I think, under US law at
- least). Basically I think what I mean is that you could sell it,
- but if you used it as part of the RSA algorithm then you'd have to
- cough up the licence fee for the patent.
-
- None of the abopve applies in the UK of course because the patent
- only applies to the US.
-
- If any of the above is inaccurate, let me know!
-
- If anyone has a US patent Number for RSA can they let me know and
- I'll go and have a read. I'm too poor to pay for the search, and
- too busy to do it myself.
-
- Simon Read.
- -------
-
- Sorry about the long line lengths I've been sending out. I hope
- I've fixed the problem.
-