[rc5] Suggestion for protocol

Anthony Towns aj at humbug.org.au
Wed Jun 25 23:09:45 EDT 1997


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On Mon, 23 Jun 1997, Remi Guyomarch wrote:

> [...]
> Thus the proxy should test the client's speed to see if there is any
> difference. Sounds delicate to do automagically...

Seems nasty for firewalled computers that are only accessible from the
proxy servers by a personal proxy. Buffering clients would have a
similar problem.

Could also be nasty for multi-processor machines. ``Your key rate is
500,000! What do you mean it takes you 40 minutes to do this piddly
key block?''

I also think verifying that the client performs the decryption is less
than wonderful. We want to verify that their answer "this block does
(not) contain a candidate key" is correct.

``So, you looked through the block?''

``Yup.''

``Find anything?''

``Maybe.''

``Okay. Lie detector test's over. Find anything?''

``Yup!''

There was some similar discussion on coderpunks a while before the
competition began, as I recall. I'm not sure if it was for DES, RSA,
RC5 or something entirely different. No one happens to remember any
details? Was anything done in the DES competition?

Cheers,
aj

- --
Anthony Towns <aj at humbug.org.au> <http://student.uq.edu.au/~s343676/>
I don't speak for anyone save myself. PGP encrypted mail preferred.

``Like the ski resort of girls looking for husbands and husbands looking
  for girls, the situation is not as symmetrical as it might seem.''

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