Re: [Asrg] Spammer proxies using legitamate mail relays

[Tony Finch <dot at dotat.at>]

Jonathan Morton <chromi at chromatix.demon.co.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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