Abstract
This paper presents the first security evaluation of the Rijndael cipher with block sizes larger than 128 bits. We describe new higher-order multiset distinguishers for such large-block instances of Rijndael. Both Rijndael and the AES were designed to resist differential and linear cryptanalysis, which is indicated by the number of active S-boxes (minimum of 25 for 4-round AES) for the best differential and linear distinguishers, for which the probability and correlation values are estimated as 2− 150 and 2− 75. All of these Rijndael variants have been formally defined by their designers as extensions of the AES. We describe new 5-round distinguishers for Rijndael with 160 up to 256-bit blocks, all holding with certainty, and with many more than 25 active S-boxes.
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Nakahara, J., de Freitas, D.S., Phan, R.C.W. (2005). New Multiset Attacks on Rijndael with Large Blocks. In: Dawson, E., Vaudenay, S. (eds) Progress in Cryptology – Mycrypt 2005. Mycrypt 2005. Lecture Notes in Computer Science, vol 3715. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11554868_20
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DOI: https://doi.org/10.1007/11554868_20
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