Re: Hashcash function...

From: Tom St Denis (tomstdenis_at_iahu.ca)
Date: 11/07/03 

Date: Fri, 07 Nov 2003 12:58:02 GMT

"Grumble" <invalid@kma.eu.org> wrote in message
news:bog0sn$rk$1@news-rocq.inria.fr...
> Tom St Denis wrote:
> > Grumble wrote:
> >> Every year, I can update my mail server's configuration to request
> >> collisions for longer keys (add a bit or 3 every year).
> >
> > That's good for people who buy high end pc's every year. Suppose
> > I'm stuck in an office with a computer from two years ago.
>
> Assume you own a Pentium 200 MHz from 1997, and let's pretend it
> really is 16 times slower than a spammer's 3.2 GHz Pentium 4.
>
> Assume my mail server configuration is such that it takes the
> spammer 250 ms to find a collision. It would take you only 4 s
> (remember, the computer I've given you is almost 7 years old).
>
> Big deal! I don't understand why you feel this is a problem.
>
> If the spammer wants to spam 50,000 of my users, he'll have to spend
> 208 minutes. If several large ISPs implemented this solution,
> spammers would really feel the pain. Imagine them trying to spam
> AOL's 30 million subscribers.

The idea is to *improve* upon the solution. We can still make the spammer
take 250ms per email [though I would aim at 20 seconds myself] just now your
older P-160 will only take ~700ms [guestimate] instead of 4s to send the
email [assuming you really wanted to make a delay of 250ms for a 200Mhz
bus].

If you guys hate invention so much then stop using your bloody computer!

Tom

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