2012 | OriginalPaper | Buchkapitel
Conditional Differential Cryptanalysis of Grain-128a
verfasst von : Michael Lehmann, Willi Meier
Erschienen in: Cryptology and Network Security
Verlag: Springer Berlin Heidelberg
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Grain-128a is a new version of the stream cipher Grain-128. To analyse the security of the cipher, we study the monomial structure and use high order differential attacks on both the new and old versions. The comparison of symbolic expressions suggests that Grain-128a is immune against dynamic cube attacks. Additionally, we find that it is also immune against differential attacks as the best attack we could find results in a bias at round 189 out of 256.