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Decoding supercodes of Gabidulin codes and applications to cryptanalysis (2103.02700v3)
Published 3 Mar 2021 in cs.CR, cs.IT, and math.IT
Abstract: 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.