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CAPTCHA: Using Hard AI Problems for Security.

, , , and . EUROCRYPT, volume 2656 of Lecture Notes in Computer Science, page 294-311. Springer, (2003)

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Human Computation. School of Computer Science, Carnegie Mellon University, (2005)Improving Image Search with PHETCH., , , and . ICASSP (4), page 1209-1212. IEEE, (2007)Provably Secure Steganography (Extended Abstract), , and . Advances in Cryptology -- CRYPTO 2002, volume 2442 of Lecture Notes in Computer Science, page 77--92. Springer, (2002)Human Computation, and . Synthesis Lectures on Artificial Intelligence and Machine Learning Morgan & Claypool Publishers, (2011)Word sense disambiguation via human computation., , , and . HCOMP@KDD, page 60-63. ACM, (2010)Behind the Scenes of Duolingo., and . EDM, page 3. International Educational Data Mining Society (IEDMS), (2015)Improving accessibility of the web with a computer game., , , , and . CHI, page 79-82. ACM, (2006)Breaking Audio CAPTCHAs., , , and . NIPS, page 1625-1632. Curran Associates, Inc., (2008)Provably Secure Steganography., , and . IEEE Trans. Computers, 58 (5): 662-676 (2009)Collective Intelligence 2012: Proceedings, and . CoRR, (2012)