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Captcha Recognision via Averaging

"This article describes how certain types of captchas (such as the ones used by a German online-banking site) can be automatically recognized using software. The attack does not recognize one particular captcha itself but exploits a design error allowing to average multiple captchas containing the same information."

Article Link: http://www.cip.physik.uni-muenchen.de/~wwieser/misc/captcha/

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