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"Cryptography Using CAPTCHA Puzzles."
Abishek Kumarasubramanian et al. (2012)
- Abishek Kumarasubramanian, Rafail Ostrovsky, Omkant Pandey, Akshay Wadia:
Cryptography Using CAPTCHA Puzzles. IACR Cryptol. ePrint Arch. 2012: 689 (2012)
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