tag:blogger.com,1999:blog-8786980130768020032011-11-28T03:10:39.740+02:00A personal take on global changesHaggai Scolnicovhttp://www.blogger.com/profile/07150942799246239862noreply@blogger.comBlogger21100tag:blogger.com,1999:blog-878698013076802003.post-46327672521209502062009-04-07T10:30:00.002+03:002009-04-07T11:02:38.595+03:00

Just a quick note, to point out how the "unbreakable" 3D CAPTCHAs, recently publicised, could probably be broken rather easily. I don't want to turn this into a blog about CAPTCHA, but a friend called me on my off-hand claim, last week, that the 3D CAPTCHAs I mentioned are just as breakable as existing varieties (or more). There only seem to be a few dozen possible objects, judging by the many

Haggai Scolnicovhttp://www.blogger.com/profile/07150942799246239862noreply@blogger.com2tag:blogger.com,1999:blog-878698013076802003.post-77347583634180908512009-04-05T10:18:00.012+03:002009-04-11T11:08:41.065+03:00

A recent wave of admiration for new 3D-flavoured CAPTCHAs got me thinking about CAPTCHAs. The whole model just doesn't hold up to technological or economic scrutiny. CAPTCHAs are doomed, because of three important "CAPTCHA gotchas". The CAPTCHA idea sounds simple: prevent bots from massively abusing a website (e.g. to get many email or social network accounts, and send spam), by giving users a

Haggai Scolnicovhttp://www.blogger.com/profile/07150942799246239862noreply@blogger.com40