Key-Dependent S-Boxes and Differential Cryptanalysis

Authors:
S. Murphy;M. J. B. Robshaw
Affiliations:
Information Security Group, Royal Holloway, University of London, Egham, Surrey, TW20 0EX. U.K. sean@dcs.rhul.ac.uk;Information Security Group, Royal Holloway, University of London, Egham, Surrey, TW20 0EX. U.K. m.robshaw@rhul.ac.uk
Venue:
Designs, Codes and Cryptography
Year:
2002

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Abstract

Key-dependent S-boxes gained some prominence in block cipher design when Twofish became an AES finalist. In this paper we make some observations on how the cryptanalyst might work with key-dependent S-boxes, we begin to develop a framework for the differential cryptanalysis of key-dependent S-boxes, and we introduce some basic techniques that were used in an analysis of reduced-round Twofish.