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Security Analysis and Related Usability of Motion-Based CAPTCHAs: Decoding Codewords in Motion.
Yi Xu
Gerardo Reynaga
Sonia Chiasson
Jan-Michael Frahm
Fabian Monrose
Paul C. van Oorschot
Published in:
IEEE Trans. Dependable Secur. Comput. (2014)
Keyphrases
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security analysis
optical flow
motion patterns
image sequences
motion estimation