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Title:
Linear Distinguishers in the Key-less Setting: Application to PRESENT
Authors: Martin M. Lauridsen, Christian Rechberger
Abstract:The application of the concept of linear cryptanalysis to the domain of key-less primitives is largely an open problem. In this paper we, for the first time, propose a model in which its application is meaningful for distinguishing block ciphers. Combining our model with ideas from message modification and rebound-like approaches, we initiate a study of cryptographic primitives with respect to this new attack vector and choose the lightweight block cipher PRESENT as an example target. This leads to known-key distinguishers over up to 27 rounds, whereas the best previous result is up to 18 rounds in the chosen-key model.
ePrint: https://eprint.iacr.org/2015/908
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