Cryptology ePrint Archive: Report 2015/1069

Indifferentiability of 8-Round Feistel Networks

Yuanxi Dai and John Steinberger

Abstract: We prove that a balanced 8-round Feistel network is indifferentiable from a random permutation. This result comes on the heels of (and is part of the same body of work as) a 10-round indifferentiability result for Feistel network recently announced by the same team of authors. The current 8-round simulator achieves similar security, query complexity and runtime as the 10-round simulator and is not significantly more involved. The security of our simulator is also slightly better than the security of the 14-round simulator of Holenstein et al. for essentially the same runtime and query complexity.

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Date: received 2 Nov 2015, last revised 17 Dec 2015

Contact author: jpsteinb at gmail com

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Version: 20151217:123017 (All versions of this report)

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