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Re: [Asrg] 3. Proof-of-work analysis

"Jon Kyme" <jrk@merseymail.com> Wed, 19 May 2004 22:56 UTC

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Subject: Re: [Asrg] 3. Proof-of-work analysis
To: ASRG <asrg@ietf.org>
From: Jon Kyme <jrk@merseymail.com>
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> Richard Clayton <richard@highwayman.com> wrote:
> >
> >Goodman & Rounthwaite have an interesting paper on using Captchas to
> >limit webmail usage (one conclusion is that you need quite a number of
> >them). It was presented at EC'04 yesterday, but the link on Joshua's
> >home page is not currently working -- I expect he'll fix it when he gets
> >home :(
> >        http://research.microsoft.com/~joshuago/
> 
> 
> Do they address the captcha-solving porn surfers attack?
> 	http://catless.ncl.ac.uk/Risks/23.17.html#subj4
> 

Ah, this one again :-)
I'd be very interested in any reference showing that that this "attack" has
actually been exploited.
cf. (may wrap)
http://www1.ietf.org/mail-archive/working-groups/asrg/current/msg09194.html





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