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

[Tony Finch <dot at dotat.at>]

Richard Clayton <richard at 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

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

_______________________________________________
Asrg mailing list
Asrg at ietf.org
https://www1.ietf.org/mailman/listinfo/asrg