In message <[EMAIL PROTECTED]>, Adam Back writes:
>Doesn't a standard digital signature plus hashcash / client puzzles
>achieve this effect?
>
>The hashcash could be used to make the client to consume more cpu than
>the server. The hashcash collision wouldn't particularly have to be
>related to the signature, as the collision would just act as a
>proof-of-work entitling the client to have the server verify the
>accompanying signature.
>
That involves extra round trips, and as such isn't suitable for all
uses.
--Steve Bellovin, http://www.research.att.com/~smb (me)
http://www.wilyhacker.com ("Firewalls" book)
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