How to Mask the Structure of Codes for a Cryptographic Use

  • Authors:
  • Thierry P. Berger;Pierre Loidreau

  • Affiliations:
  • LACO, Département de Mathématiques, Université de Limoges, France;Unite de Mathématiques, Appliquées, National Institute of Advanced Technologies (ENSTA), France

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2005

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Abstract

In this paper we show how to strengthen public-key cryptosystems against known attacks, together with the reduction of the public-key. We use properties of subcodes to mask the structure of the codes used by the conceiver of the system. We propose new parameters for the cryptosystems and even a modified Niederreiter cryptosystem in the case of Gabidulin codes, with a public-key size of less than 4000 bits.