Cryptology ePrint Archive: Report 2004/188

Grey Box Implementation of Block Ciphers Preserving the Confidentiality of their Design

Vincent Carlier and Hervé Chabanne and Emmanuelle Dottax

Abstract: In 1997,Patarin and Goubin introduce new asymmetric cryptosystems based on the difficulty of recovering two systems of multivariate polynomials from their composition. We make a different use of this difficult algorithmic problem to obtain a way of representing block ciphers concealing their design but still leaving them executable. We show how to implement our solution with Field Programmable Gate Array. Finally, we give a compact representation of our solution using Binary Decision Diagrams.

Category / Keywords: implementation / information hiding

Date: received 2 Aug 2004, last revised 18 Mar 2005

Contact author: Emmanuelle Dottax at sagem com

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Version: 20050318:165104 (All versions of this report)

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