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- Newsgroups: sci.crypt
- Path: sparky!uunet!mcsun!sunic!nobeltech!admin.kth.se!saaf.se!pausch
- From: pausch@saaf.se (Paul Schlyter)
- Subject: Re: User authentication (was Re: secure netnews)
- Message-ID: <1992Aug26.211746.2838@saaf.se>
- Organization: SAAF, Svensk Amat|rAstronomisk F|rening
- References: <1992Aug21.864.168@ALMAC> <5894@transfer.stratus.com>
- Distribution: sci
- Date: Wed, 26 Aug 92 21:17:46 GMT
- Lines: 44
-
- In article <5894@transfer.stratus.com> cme@ellisun.sw.stratus.com (Carl Ellison) writes:
- >In article <1992Aug21.864.168@ALMAC> keith.willis@almac.co.uk writes:
- >>
- >> RSA public keys certified by genetic fingerprint, that being
- >> verifiable against that held by a central trusted authority?
- >>
- >
- >
- >I just don't see what the big deal is. You'll never meet me. You
- >can't care what I look like much less what genes I have. If you were to
- >know, would that make my identification any more positive?
- >
- >
- >If I give you an RSA key, that's all you need. I'm the only one in the world
- >who knows the two primes in N. That defines *me*. Balding head or not,
- >height, weight, ..., even gender is all irrelevant.
- >
- >I can prove I know those primes by signing something. You can verify that
- >I know the primes, without learning the primes -- therefore without becoming
- >able to pretend to be me.
- >
- >What more do you want?
-
-
- Well, you can't prove that you've kept those primes secret and haven't told
- anybody else about them, for instance....
-
- And during such circumstances (we've never met and never will meet, I'm not
- interested in any positive ID like genes, fingerprints etc, and all I know
- is that you say that you've signed a messages and haven't revealed to anyone
- else how to sign it in the same way), who needs RSA signatures? They would
- really say no more than your name and email address. Actually they would
- even say less, since your email address at least tells where you're located.
-
- For RSA signatures to be meaningful, there must be a good reason to use it.
- I.e. the sender must have a good reason not to reveal his signatures, and
- the receiver must have a good reason to know who actually sent the message.
- If this doesn't metter too much, then RSA is not needed.
-
- --
- ---
- Paul Schlyter, Swedish Amateur Astronomer's Society (SAAF)
- Nybrogatan 75 A, 6 tr, S-114 40 Stockholm, Sweden
- InterNet: pausch@saaf.se
-