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Cryptanalysis of a cognitive authentication scheme


We present attacks against two recently proposed cognitive authentication schemes [W06]. These authentication schemes are designed to be secure against eavesdropping attacks while relying only on human cognitive skills. They achieve authentication via challenge response protocols based on a shared secret set of pictures. Our attacks use a SAT solver to recover a user's key in a few seconds, after observing only a small number of successful logins. These attacks demonstrate that the authentication schemes of [W06] are not secure against an eavesdropping adversary.

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Golle, P. ; Wagner, D. Cryptanalysis of a cognitive authentication scheme. IEEE Symposium on Security and Privacy 2007; 2007 May 20-23; Oakland, CA; USA.


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