[Resource Topic] 2016/337: State recovery of RC4 and Spritz Revisited

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Title:
State recovery of RC4 and Spritz Revisited

Authors: Martin Gábriš, Martin Stanek

Abstract:

We provide an improved complexity analysis of backtracking-based state recovery attacks on RC4 and Spritz. Comparing new estimates with known results on Spritz, our analysis shows a significantly lower complexity estimate for simple state recovery attack as well as special state recovery attack. We validated the estimates by performing experiments for selected feasible parameters. We also propose a prefix check optimization for simple state recovery attack on Spritz. We believe that the simple state recovery attack with this optimization and so-called ``change order’’ optimization inspired by Knudsen et al. attack on RC4 constitutes currently the best state recovery attack on Spritz (when no special state is observed).

ePrint: https://eprint.iacr.org/2016/337

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