I experienced animated GIF captchas with Yahoo's login process. Not sure if that... | Hacker News

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_wiv7 on June 25, 2014 | parent | context | favorite | on: Captchas are Becoming Ridiculous

I experienced animated GIF captchas with Yahoo's login process. Not sure if that was better or worse than reCaptcha.

pornel on June 25, 2014 [–]

I don't get why they're doing this. Animation adds information and makes CAPTCHA easier to break!

Attacker can choose the frame that's easiest to attack and they can segment better with help of motion vectors and differences between frames.

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