> On 5/3/08, Zbigniew Szalbot wrote:
> > If the unsubscribe script cannot be exploited remotely, then
> > I do not see probing as a real threat (especially if additionally secured
> > by some captcha code or the like).
Note that people seem to really want one-click unsubscription.
CAPTCHA violates that design goal bigtime.
Brad Knowles writes:
> CAPTCHAs are not secure.
CAPTCHA-meme, die! Die, die, die, I say! Die-die-die-die-die!
Anyway, what Brad said being taken as given, what seems to be the case
is that trivial CAPTCHAs like
<!-- Guess which FAQ-o-matic uses this CAPTCHA, successfully AFAIK! -->
<form>
Please type "CAP-ME" in the box:
<input type="password" size="32"
name="nobody_would_guess_im_a_captcha_cause_theres_no_image">
<submit>
</form>
give all the protection that a CAPTCHA can give. This is somewhat
effective, because if the 'bot doesn't expect that particular CAPTCHA,
it will lose. And that's the best you can do.
What I conclude is that CAPTCHAs are a reasonable way for some low-to-
moderate-traffic sites to shift the burden of spam-fighting to their
users and to other sites, but that if Mailman ever implemented one,
that would immediately make Mailman sites a target for automated
CAPTCHA breaking. So sites serious about using CAPTCHA to discourage
spamming would need to implement their own, anyway.
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