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Asymmetric cryptography with S-Boxes Is it easier than expected to design efficient asymmetric cryptosystems?

  • Jacques Patarin
  • Louis Goubin
Session 12: Public Systems II
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1334)

Abstract

In this paper, we study some new “candidate” asymmetric cryptosystems based on the idea of hiding one or two rounds of small S-box computations with secret functions of degree one or two. The C” scheme of [10] (when its n i values are small can be seen as a very special case of these schemes. This C” scheme was broken in [11] due to unexpected algebraic properties. In the new schemes, those algebraic properties generally do not exist. Nevertheless, we will see that most of the “new” algorithms can also be broken and we deduce some very different cryptanalysis of C”.

However, we were not able to find the cryptanalysis of all the new schemes, for example for two round schemes. An interest of the paper lies therefore in the highlighting of these new schemes. The main practical advantage of these schemes is that secret computations are easy and can be performed in low-cost smartcards.

An extended version of this paper can be obtained from the authors.

Keywords

Finite Field Multivariate Polynomial Round Function Functional Decomposition Differential Cryptanalysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • Jacques Patarin
    • 1
  • Louis Goubin
    • 1
  1. 1.Bull PTSLouveciennes CedexFrance

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