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  • From: Jeremy Portzer <jeremyp AT pobox.com>
  • To: "Internetworkers: http://www.ibiblio.org/internetworkers/" <internetworkers AT lists.ibiblio.org>
  • Subject: C/R system math - Re: [internetworkers] Re: SPAM the SPAMMERS
  • Date: Thu, 20 Nov 2003 12:04:52 -0500

On Thu, 2003-11-20 at 11:54, Tanner Lovelace wrote:
> Steven Champeon wrote:
>
> > No, all those messages come from the C/R system. Or maybe I'm not
> > following you.
>
> Apparently you're not. What I suggested was this. Suppose C-R systems in
> general reach a 1% penetration rate. That is, 1% of all people use some
> sort of challenge response system. It could be something they've
> setup on their own system, it could be something their ISP has setup.
> It is *by* *no* *means* one system. Then, suppose someone sends a spam
> with a *real*, forged return address to 1 million people. Because we
> supposed
> C-R systems have a 1% penetration rate that means, on average, 100,000
> of those people will have some form of C-R system setup. This means
> the person who's e-mail was forged will then receive aproximately
> 100,000 "challenges" from those people's C-R systems, not from *one*
> system.

Except that 1% of one million is 10,000, not 100,000. But a spam could
be sent out to 10 million people in your scenario to result in 100,000
C-R responses.

--Jeremy

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