Abstract
Differentials with low probability are used in improbable differential cryptanalysis to distinguish a cipher from a random permutation. Due to large diffusion, finding such differentials for actual ciphers remains a challenging task. At Indocrypt 2010, Tezcan proposed a method to derive improbable differential distinguishers from impossible differential ones. In this paper, we discuss the validity of the assumptions made in the computation of the improbable differential probabilities. In particular, we show based on experiments that such improbable differential cryptanalysis can fail. The validity of the improbable differential cryptanalyses on PRESENT and CLEFIA is discussed.
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Blondeau, C. (2013). Improbable Differential from Impossible Differential: On the Validity of the Model. In: Paul, G., Vaudenay, S. (eds) Progress in Cryptology – INDOCRYPT 2013. INDOCRYPT 2013. Lecture Notes in Computer Science, vol 8250. Springer, Cham. https://doi.org/10.1007/978-3-319-03515-4_10
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DOI: https://doi.org/10.1007/978-3-319-03515-4_10
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