Differential Forgery Attack against LACReport as inadecuate

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* Corresponding author 1 SECRET - Security, Cryptology and Transmissions Inria Paris-Rocquencourt

Abstract : LAC is one of the candidates to the CAESAR competition. In this paper we present a differential forgery attack on LAC. We study the collection of characteristics following a fixed truncated characteristic, in order to obtain a lower bound on the probability of a differential. We show that some differentials have a probability higher than 2^-64 , which allows a forgery attack on the full LAC. This work illustrates the difference between the probability of differentials and characteristics, and we describe tools to evaluate the probability of some characteristics.

Keywords : Differential cryptanalysis differentials characteristics forgery attack truncated differential LBlock LAC

Author: Gaëtan Leurent -

Source: https://hal.archives-ouvertes.fr/


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