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New algorithms for decoding in the rank metric and an attack on the LRPC cryptosystem

We consider the decoding problem or the problem of finding low weight codewords for rank metric codes. We show how additional information about the codeword we want to find under the form of certain linear combinations of the entries of the codeword leads to algorithms with a better complexity. This is then used together with a folding technique for attacking a McEliece scheme based on LRPC codes. It leads to a feasible attack on one of the parameters suggested in \cite{GMRZ13}.

preprint2015arXivOpen access
Adrien HautevilleJean-Pierre Tillich
math.ITInformation TheoryCryptography and Security
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Adrien HautevilleJean-Pierre Tillich

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