David Maxwell <david(_at_)crlf(_dot_)net>:
Another issue is that [hash-cash] begins a trend of requiring CPU power to
participate in the Internet.
That's a bad thing for people who want to provide inexpensive computing
to third world countries, and for the retro-computing crowd.
Once Hashcash became widely used, CPU vendors would have an incentive to
encourage spam, in order to push the rate of 'stamps' up, and make
people upgrade their machines. For the single home user, it wouldn't
matter so much, but I run some mailing-lists for friends...
Basing an anti-spam mechanism on technology have/have-nots would seem to
be a difficult balance to achieve, when the spammers have financial
incentive, and I don't.
These are damn good, solid points.
I'm still in favor of acknowledging the existence of hash-cash ideas in the
challenge-response section, but you've done an excellent job of arguing
that they're not actually a good idea.
On the gripping hand, this argument is out of scope for the document.
--
<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>
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