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| Subject: | Re: Thoughts on CAPTCHA |
|---|---|
| Date: | Wed, 16 Apr 2008 17:40:35 +0100 |
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Gregory Rubin wrote: | KitttenAuth looks very similar to ASIRRA (Microsoft's contribution to the area).
Wasn't familiar with this... thanks for the headsup.
| I think that so long as the image library behind them is sufficiently | large (which is the biggest problem) then these would work very well | as CAPTCHAs.
You can artifcially increase the size of the search space by flipping/distorting images, moving them by a single pixel within their bounding images, colour shifting them etc. All makes it slightly more difficult to bruteforce by attempting to train the system.
| And though the current incarnations use AJAX, I see nothing in them | that precludes the use of normal forms without javascript.
Any good system should be able to cope with a lack of JS enablement IMHO...
| Greg
Mike -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
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