[IMC-Tech] Captcha implementation: which way to choose?

[MJ Ray]

ekes wrote:
> Don't know about you but I've never managed to filter spam on a site
> reliably with _only_ baysian stats (+ usual rules on so many external
> links etc.) If not using an external service - which as Ringo points out
> elsewhere isn't an option for Indymedia because it leaks information to
> third party sites I've always required some additional captcha. How
> inaccessible these captchas are depends... one of the present favourites
> just includes a visibly hidden field you are told not to fill in - but
> bots tend to anyway.

Hidden fields are better than most captchas, as is scrambling/cycling
input name=""s but they're still not anti-spam.  Useful, but not a
test for spamming as such.  Good against bulk submissions/floods.

I've always resorted to humans reviewing a laaarge grey area, but I
suspect indymedia doesn't have enough volunteers to do that on all
the sites.  Doesn't excuse blocking disabled users, though.
-- 
MJ Ray, Worker-owner (webmaster since 1994, grad. statistician)
http://www.software.coop/