Richard Clayton <richard(_at_)highwayman(_dot_)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
Tony.
--
f.a.n.finch <dot(_at_)dotat(_dot_)at> http://dotat.at/
FITZROY: VARIABLE 3 OR LESS IN SOUTH, OTHERWISE NORTHEASTERLY 3 OR 4,
OCCASIONALLY 5. FAIR. MODERATE WITH FOG PATCHES.
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