More CAPTCHA follies

We’ve posted a good bit about CAPTCHAs, the automated techniques that try to distinguish humans from vile software bots when visiting websites or registering for accounts, such as the blurry letters you have to type into a box. It’s an arms race between CAPTCHA designers and bot designers, with visually impaired users as collateral damage.

The latest design calls for users to click near the geometric center of any image in a composite set of wall-to-wall images drawn from a database. That’s only step one; step two shows you another image, which you must identify from a list of options. They’re gonna have to get really creative to figure out a non-visual approach to this task. And hey, webmaster, is your site’s porn late medieval Italian poetry really worth all this effort?

Ars Technica: Researchers stay step ahead of bots with image-based CAPTCHA

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