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"Side-channel Attack on the HumanAuth CAPTCHA."
Carlos Javier Hernández-Castro, Arturo Ribagorda, Yago Sáez (2010)
- Carlos Javier Hernández-Castro, Arturo Ribagorda, Yago Sáez:
Side-channel Attack on the HumanAuth CAPTCHA. SECRYPT 2010: 59-65
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