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- Path: sparky!uunet!mcsun!uknet!ALMAC!keith.willis
- From: keith.willis@almac.co.uk
- Newsgroups: sci.crypt
- Subject: authentication
- Message-ID: <1992Aug28.864.24@ALMAC>
- Date: 28 Aug 92 12:31:27 GMT
- Distribution: sci
- Organization: ALMAC BBS Ltd
- Lines: 56
-
-
-
- [on 25 Aug 1992, Carl Ellison said]
-
- CE> I just don't see what the big deal is. You'll never meet me. You
- CE> can't care what I look like much less what genes I have. If you were to
- CE> know, would that make my identification any more positive?
-
- Oh, I agree. But in the given scenario, which was that I
- had to come to some arrangement with an unknown person, you
- for example, which would allow me to know for definite that
- future communications purporting to come from you, were in
- fact from you. A rider was that a third person was posited
- who was deliberately attempting to subvert this secure
- channel (I believe it was 'George Bush's evil brother
- Skippy':-).
-
- CE> If I give you an RSA key, that's all you need. I'm the only one in the world
- CE> who knows the two primes in N. That defines *me*. Balding head or not,
-
- As I said before, I have no way of knowing, for example, that
- the public key that you see attached to the foot of this
- letter is the one I put there. A hypothetical intruder
- could substitute his own. Likewise, when you send your key
- to _me_, he could do the same. That way, he could intercept
- your mail to me, read it, alter it, and then encrypt a
- completely different message, forward it to me, and I would
- have no way of knowing that it did not come from you.
-
- Maybe I'm missing something here, but I keep coming back to
- the idea that a 'trusted central authority' is always
- required.
-
- CE> What more do you want?
-
- A bit more <g>
-
-
- ---
- ~ PQ 2.15 194 ~
- -- keith.willis@almac.co.uk --------------PGP v1.0 public key
-
- section 1 of xxencode 5.15 of file keith.pub by R.E.M.
-
- begin 644 keith.pub
- haP++EVMp8WdLOKlgOLAg62hZOLFc60+U60-fNKZoO0trOKlgOLB+MKlhMKAi
- hMqwiRKjS+yJyZtYZQTYA4SG-hicSo98DNzwCFBRrYnazPCxQocdfDsxJmvo0
- htIFn-XszZZFRZP4qMkiQN8JTNxApqAeD6LnR+XBHn9S89L+FovMBMl8UzU0d
- gdm6JBZFu8wURFrIGcpQs8yrb5bsgM1mEXUPRx64UdlSE1GAIbUaNanQ3+-23
- +
- end
- sum -r/size 64445/274 section (from "begin" to "end")
- sum -r/size 57997/179 entire input file
- --
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