Welcome to the resource topic for 2013/288
Title:
Key Classification Attack on Block Ciphers
Authors: Maghsoud Parviz, Seyed Hassan Mousavi, Saeed Mirahmadi
Abstract:In this paper, security analysis of block ciphers with key length greater than block length is proposed. For a well-designed block cipher with key length k and block length n s.t. k>n and for all P, C, there are 2^{k-n} keys which map P to C. For given block cipher, if there is an efficient algorithm that can classify such keys, we propose an algorithm will be able to recover the secret key with complexity O(max{2^n, 2^{k-n}}). We apply this method on 2-round block cipher KASUMI.
ePrint: https://eprint.iacr.org/2013/288
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