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Paper 2020/285
Improved Security Bounds for Generalized Feistel Networks
Yaobin Shen and Chun Guo and 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.
Metadata
- Available format(s)
- Category
- Secret-key cryptography
- Publication info
- Published by the IACR in FSE 2020
- Keywords
- Block ciphersCouplingTweakable block ciphersGeneralized Feistel networksProvable securityMode of operation
- Contact author(s)
- yb_shen @ sjtu edu cn
- History
- 2020-03-06: received
- Short URL
- https://ia.cr/2020/285
- License
-
CC BY