On the sequential indifferentiability of the Lai–Massey construction
Designs, Codes and Cryptography(2024)
摘要
We study the Lai–Massey construction defined over bit strings w.r.t. the notion of sequential indifferentiability, which was introduced by Mandal et al. (in: Cramer (ed) TCC 2012, LNCS, Springer, Heidelberg, vol 7194, pp 285–302, 2012) and formalized known-key security of blockcipher structures. We first exhibit a sequential distinguisher against 5-round Lai–Massey structure when the underlying orthomorphism is linear. This enhances a 2011 result of Aumasson. As our main result, we (for the first time) prove sequential indifferentiability for 6-round Lai–Massey constructions (on bit strings) using six independent random round functions.
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关键词
Blockcipher,Lai–Massey construction,provable security,sequential indifferentiability
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