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- Path: sparky!uunet!walter!att!att!ulysses!ulysses.att.com!smb
- From: smb@ulysses.att.com (Steven Bellovin)
- Newsgroups: sci.crypt
- Subject: Re: Cheap RSA chips? (Was: Re: shift registers??)
- Message-ID: <17112@ulysses.att.com>
- Date: 21 Aug 92 15:10:30 GMT
- References: <1992Aug19.864.126@ALMAC> <1992Aug20.160528.2155@nessie.mcc.ac.uk>
- Sender: netnews@ulysses.att.com
- Distribution: sci
- Lines: 16
-
- In article <1992Aug20.160528.2155@nessie.mcc.ac.uk>, segr@nessie.mcc.ac.uk (Simon Read) writes:
- > I can't see how Rivest Shamir and Adleman can have a patent on
- > performing exponentiation (patents cannot cover maths).
-
- They patented a ``cryptographic communications system'' based on the
- RSA equations. They didn't claim either exponentiation or any particular
- way of doing it. As a consequence, if you found a new use for those
- exponentiations that's neither claimed by the patent, nor a derivative
- of any of its claims, you wouldn't infringe, even though you were
- doing the exact same things.
-
- > 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.
-
- 4,405,829.
-