Efficient lattice-based signature scheme

  • Authors:
  • Thomas Plantard;Willy Susilo;Khin Than Win;Qiong Huang

  • Affiliations:
  • Centre for Computer and Information Security Research, School of Computer Science and Software Engineering, University of Wollongong, Wollongong NSW 2522, Australia.;Centre for Computer and Information Security Research, School of Computer Science and Software Engineering, University of Wollongong, Wollongong NSW 2522, Australia.;School of Information Systems and Technology, University of Wollongong, Wollongong NSW 2522, Australia.;Department of Computer Science, City University of Hong Kong, Hong Kong, China

  • Venue:
  • International Journal of Applied Cryptography
  • Year:
  • 2008

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Abstract

In Crypto 1997, Goldreich, Goldwasser and Halevi (GGH) proposeda lattice analogue of McEliece public key cryptosystem, in whichsecurity is related to the hardness of approximating the ClosestVector Problem in a lattice. Furthermore, they also described howto use the same principle of their encryption scheme to provide asignature scheme. Practically, this cryptosystem uses the Euclideannorm, l2-norm, which has been used in many algorithmsbased on lattice theory. Nonetheless, many drawbacks have beenstudied and these could lead to cryptanalysis of the scheme. Inthis article, we present a novel method of reducing a vector underthe l∞-norm and propose a digital signature schemebased on it. Our scheme takes advantage of thel∞-norm to increase the resistance of the GGHscheme and to decrease the signature length. Furthermore, aftersome other improvements, we obtain a very efficient signaturescheme, that trades the security level, speed and space.