Jonathan Morton <chromi(_at_)chromatix(_dot_)demon(_dot_)co(_dot_)uk> wrote:
You've heard of hashcash, naturally.
And exactly how long do you expect it will take for spammers to
install a hashcash computing trojan on their 5 million zombie PCs?
There are 5 million zombies, perhaps, but there are many *more*
legitimate e-mail users.
If you want to analyse hashcash's effectiveness, you should read
Richard Clayton and Ben Laurie's paper which uses real numbers
from a medium-sized ISP to show that it cannot be made to work.
http://www.cl.cam.ac.uk/~rnc1/
Tony.
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