[Metalab] Wiki Gardening

[Peter J. Holzer]

On 2013-01-14 17:44:43 +0100, overflo wrote:
> captchas are automatically cracked these days..
> i'd suggest to implement the raumzeitlabor time thing or something
> similar that needs a certain understanding of the language + human
> skills to figure it out..
> i saw a kitten captcha once..
> there were 20 kittens and one puppy.. you click the puppy you get
> in.. something like this..

The problem with kittenauth and similar captchas is that there are
usually too few combinations: If you have to click on the right image
out of 21, you have a 5 % chance even if you are guessing blindly. And
if you guess wrong, you have another 5 % chance at the next try. A human
might become bored or annoyed before getting in, but bots are patient.

If there are enough combinations to make it hard for bots, it becomes
hard for humans, too.

	hp

-- 
   _  | Peter J. Holzer    | Der eigene Verstand bleibt gefühlt messer-
|_|_) | Sysadmin WSR       | scharf. Aber die restliche Welt blickt's
| |   | hjp at hjp.at         | immer weniger.
__/   | http://www.hjp.at/ |   -- Matthias Kohrs in desd
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