Client puzzles are interactive, but hashcash is non-interactive being
intended to support store-and-forward scenarios -- the client
effectively chooses his own challenge. There's a reference library
for client and server here:
http://www.cypherspace.org/hashcash/
Adam
On Fri, Jun 21, 2002 at 11:42:22AM -0400, Steven M. Bellovin wrote:
> In message <[EMAIL PROTECTED]>, Adam Back writes:
> >Doesn't a standard digital signature plus hashcash / client puzzles
> >achieve this effect?
>
> That involves extra round trips, and as such isn't suitable for all
> uses.
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