J.L. Lai, X. Massey and S. Murphy. Markov Ciphers and Differential Crytpanalysis. In Advances in Cryptology, Proceedings of EUROCRYPT 91, pages 17--38. Springer--Verlag LNCS 547, 1991.  Home/Search   Document Not in Database   Summary   Related Articles

....posterior distributions one pair at a time and using them as prior distributions for the next iteration. The Bayesian approach has often been used in the analysis of block and stream ciphers both explicitly, for example [18] 3] 8] and implicitly in key ranking techniques, for example [13] [16] The problem of testing whether a key class is the true key class can also be expressed in terms of hypothesis testing, another routine statistical technique [23] Hypothesis testing has been used by Brynielsson [6] to find stream cipher keys. Suppose we wish to test the null hypothesis H 0 ....

....to defining the partition functions to be projections onto certain n dimensional subspaces rather than 1 dimensional ones. 6 Differential Cryptanalysis In this Section, we show how differential cryptanalysis first described by Biham and Shamir [5] and generalised by Lai, Massey and Murphy [13] can be expressed in the likelihood framework. Suppose we have a block cipher with message space M , and i th round subkey k i 2 M in which m 0 is the plaintext and m n is the ciphertext, and the i th round encryption is given by m i = m i Gamma1 fi k i )T [i = 1 Delta Delta Delta n] ....

J.L. Lai, X. Massey and S. Murphy. Markov Ciphers and Differential Crytpanalysis. In Advances in Cryptology, Proceedings of EUROCRYPT 91, pages 17--38. Springer--Verlag LNCS 547, 1991.

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