Decoding supercodes of Gabidulin codes and applications to cryptanalysis

03/03/2021

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by   Maxime Bombar, et al.

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This article discusses the decoding of Gabidulin codes and shows how to extend the usual decoder to any supercode of a Gabidulin code at the cost of a significant decrease of the decoding radius. Using this decoder, we provide polynomial time attacks on the rank-metric encryption schemes RAMESSES and LIGA.