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Title:
Improved Security Bounds for Generalized Feistel Networks
Authors: Yaobin Shen, Chun Guo, Lei Wang
Abstract:We revisit the security of various generalized Feistel networks. Concretely, for unbalanced, alternating, type-1, type-2, and type-3 Feistel networks built from random functions, we substantially improve the coupling analyzes of Hoang and Rogaway (CRYPTO 2010). For a tweakable blockcipher-based generalized Feistel network proposed by Coron et al. (TCC 2010), we present a coupling analysis and for the first time show that with enough rounds, it achieves 2n-bit security, and this provides highly secure, double-length tweakable blockciphers.
ePrint: https://eprint.iacr.org/2020/285
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