Selected Areas in Cryptography: 19th International by Martin R. Albrecht, Gregor Leander (auth.), Lars R. Knudsen,

By Martin R. Albrecht, Gregor Leander (auth.), Lars R. Knudsen, Huapeng Wu (eds.)

This publication constitutes the completely refereed post-conference complaints of the nineteenth overseas convention on chosen components in Cryptography, SAC 2012, held in Windsor, Ontario, Canada, in August 2012. The 24 papers provided have been rigorously reviewed and chosen from 87 submissions. they're prepared in topical sections named: cryptanalysis, electronic signatures, flow ciphers, implementations, block cipher cryptanalysis, lattices, hashfunctions, blockcipher buildings, and miscellaneous.

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Extra resources for Selected Areas in Cryptography: 19th International Conference, SAC 2012, Windsor, ON, Canada, August 15-16, 2012, Revised Selected Papers

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R. Knudsen and H. ): SAC 2012, LNCS 7707, pp. 34–49, 2013. c Springer-Verlag Berlin Heidelberg 2013 Cryptanalysis of the Xiao – Lai White-Box AES Implementation 35 set-top box or a mobile phone. A malicious end-user may attempt to extract a secret key used for content decryption from the software. Next, the end-user may distribute this key to non-entitled end-users, or the end-user may use this key to decrypt the content directly, circumventing content usage rules. White-box cryptography was introduced in 2002 by Chow, Eisen, Johnson and van Oorschot in [4,5], and aims at protecting a secret key in a white-box environment.

F256 (x0 )]. Any flip of ei , i = 129, . . , 256 will lead to Result(Result({f1 + e1 , . . , f128 + e128 }), fi + ei + 1) = 1, so this branch will be cut off instantly. Based on the above observation, given a ubound , the running time of ISBS is almost equal to the time of searching and solving {f1 +e1 , f2 +e2 , . . , f128 +e128 } where [e1 , . . , e128 ] satisfies u(e1 , e2 , . . , e128 ) ≤ ubound and u(e1 , e2 , . . , e128 ) is the value of the cost function corresponding to [e1 , e2 , .

Fk−1 + ek−1 , fk + 1} will not be better than the stored one, thus we cut off the following branches and backtrack to ek−1 . The loop of Step 4 ends when k = 0 which means that we have exhaustively searched all possible branches except the redundant ones and the candidate we stored is the best one among all the points in Fn2 . Finally, we obtain solutions from S by Step 5, and this procedure is very easy when S is some triangular sets or a Gr¨obner Basis. In most time when m > n, S has very simple structure which only contain several points.

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