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- Newsgroups: sci.crypt
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!mips!sdd.hp.com!usc!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!daisy.learning.cs.cmu.edu!Marc.Ringuette
- From: Marc.Ringuette@daisy.learning.cs.cmu.edu
- Subject: Re: Secure netnews
- Message-ID: <9208192042.AA23609@news.cis.ohio-state.edu>
- Sender: daemon@cis.ohio-state.edu
- Organization: The Ohio State University Department of Computer and Information Science
- Date: Wed, 19 Aug 1992 20:19:00 GMT
- Lines: 40
-
- dla@iso (Don Alvarez) writes,
- > The problem has NOTHING to do with encryption. No matter how you
- > encrypt/sign/etc your message, we are still faced with the fact that
- > you and I have never met and know nothing about each other.
-
- Ahhhhhh. I wish you'd said that in the first place. :-(
-
- You're right, there's a fundamental problem of how to establish the
- necessary trust that at least SOME FRACTION of the other people
- participating in the network are honest. The amount of trust that you
- place in the secure newsgroup should be exactly proportional to your
- trust in the majority of its participants.
-
- For most electronic stuff on the internet, a reasonable solution is
- "trust by reputation." If a large number of respectable "net citizens"
- are members, then you're in good shape.
-
- Another method is to make sure that each participant corresponds to a
- real person or organization, by making sure that a few of the current
- members physically meet, or at least talk on the telephone, with every
- prospective new member. There should also be limits on how quickly the
- membership may change. This prevents "flooding" the membership with
- bogus entries, and makes cheating coalitions harder to form.
-
- ---
-
- If you're unsatisfied with this, then please consider my proposal to be
- a thought-experiment, which begins with the premise,
-
- "Assume you have the public keys of N people, and are willing to
- trust that no more than 10% of them will form a cheating coalition.
- Implement a secure newsgroup."
-
- I think this is an interesting premise, and I would hope that most
- of our ensuing discussion will be willing to take it for granted.
- Discussion about the premise is also OK with me, though.
-
-
- M.
-
-