[Resource Topic] 2009/553: Cryptanalysis of a key exchange scheme based on block matrices

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Title:
Cryptanalysis of a key exchange scheme based on block matrices

Authors: Maria Isabel Gonzalez Vasco, Angel L. Perez del Pozo, Pedro Taborda Duarte

Abstract:

In this paper we describe a cryptanalysis of a key exchange scheme recently proposed by Alvarez, Tortosa, Vicent and Zamora. The scheme is based on exponentiation of block matrices over a finite field of prime order. We present an efficient reduction of the problem of disclosing the shared key to the discrete logarithm problem (DLP) in an extension of the base field.

ePrint: https://eprint.iacr.org/2009/553

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