Key-Dependent S-Boxes and Differential Cryptanalysis |
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| Authors: | S Murphy M J B Robshaw |
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| Institution: | (1) Information Security Group, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, U.K |
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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. |
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| Keywords: | cryptography block ciphers twofish differential cryptanalysis S-boxes |
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