Thread View: sci.crypt
2 messages
2 total messages
Started by keith.willis
Fri, 28 Aug 1992 12:31
authentication
Author: keith.willis
Date: Fri, 28 Aug 1992 12:31
Date: Fri, 28 Aug 1992 12:31
56 lines
2540 bytes
2540 bytes
[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
--
ALMAC BBS Ltd. 0324-665371
Dos based USENET access, call for details!
Re: authentication
Author: Joe Wang
Date: Sun, 30 Aug 1992 23:00
Date: Sun, 30 Aug 1992 23:00
8 lines
877 bytes
877 bytes
In article <1992Aug28.864.24@ALMAC> keith.willis@almac.co.uk writes: > 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. You could call up random sites receiving sci.crypt and ask them what public key they received was and then compare that to the one you sent.
Thread Navigation
This is a paginated view of messages in the thread with full content displayed inline.
Messages are displayed in chronological order, with the original post highlighted in green.
Use pagination controls to navigate through all messages in large threads.
Back to All Threads