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    Re: CAPTCHAs-Understanding CAPTCHA-Solving Services in an Economic Context
    13 years 2 months ago
    Re: CAPTCHAs-Understanding CAPTCHA-Solving Services in an Economic Context
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    Reverse Turing tests, or CAPTCHAs, have become an ubiquitous defense used to protect open Web resources from being exploited at scale. An effective CAPTCHA resists existing mechan...
    Marti Motoyama, Kirill Levchenko, Chris Kanich, Da...
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