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The well-known stream cipher Grain-128a is the new version of Grain-128. While Grain-128 is vulnerable against several introduced attacks, Grain-128a is claimed to be secure against all known attacks and observations on Grain-128. So far the only published single-key attack on Grain-128a is the conditional differential cryptanalysis proposed by Michael Lehmann et al. at CANS 2012. In their analysis,...
Conditional differential cryptanalysis on NFSR-based cryptosystems was first proposed by Knellwolf et al. in Asiacrypt 2010 and has been successfully used to attack reduced variants of Grain v1. In this paper, we greatly improve conditional differential attacks on Grain v1 in the following four aspects. First, a new differential engine is derived to correctly track the differential trails of Grain...
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