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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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CAPTCHA: Using Hard AI Problems for Security., , , and . EUROCRYPT, volume 2656 of Lecture Notes in Computer Science, page 294-311. Springer, (2003)Public-Key Steganography., and . EUROCRYPT, volume 3027 of Lecture Notes in Computer Science, page 323-341. Springer, (2004)Provably Secure Steganography., , and . IEEE Trans. Computers, 58 (5): 662-676 (2009)Collective Intelligence 2012: Proceedings, and . CoRR, (2012)TagATune: A Game for Music and Sound Annotation., , , and . ISMIR, page 361-364. Austrian Computer Society, (2007)Improving accessibility of the web with a computer games, , , , and . CHI, page 79-82. ACM, (2006)Duolingo: learn a language for free while helping to translate the web.. IUI, page 1-2. ACM, (2013)Human Computation.. ICDE, page 1-2. IEEE Computer Society, (2008)Human Computation. School of Computer Science, Carnegie Mellon University, (2005)Provably Secure Steganography (Extended Abstract), , and . Advances in Cryptology -- CRYPTO 2002, volume 2442 of Lecture Notes in Computer Science, page 77--92. Springer, (2002)