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Algebraic analysis of the SSS stream cipher

Al Mashrafi, Mufeed, Koon-Ho Wong, Kenneth, Simpson, Leonie, Bartlett, Harry, & Dawson, Edward (2011) Algebraic analysis of the SSS stream cipher. In Proceedings of the 4th international conference on Security of information and networks, ACM, Macquarie Graduate School of Management, Sydney, NSW, pp. 199-204.

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Abstract

Both the SSS and SOBER-t32 stream cipher designs use a single word-based shift register and a nonlinear filter function to produce keystream. In this paper we show that the algebraic attack method previously applied to SOBER-t32 is prevented from succeeding on SSS by the use of the key dependent substitution box (SBox) in the nonlinear filter of SSS. Additional assumptions and modifications to the SSS cipher in an attempt to enable algebraic analysis result in other difficulties that also render the algebraic attack infeasible. Based on these results, we conclude that a well chosen key-dependent substitution box used in the nonlinear filter of the stream cipher provides resistance against such algebraic attacks.

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ID Code: 48792
Item Type: Conference Paper
Keywords: algebraic attacks, stream ciphers, SSS, eSTREAM, multivariate equations
DOI: 10.1145/2070425.2070457
ISBN: 9781450310208
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > COMPUTER SOFTWARE (080300) > Computer System Security (080303)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Past > Institutes > Information Security Institute
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 ACM
Deposited On: 22 Feb 2012 08:51
Last Modified: 22 Feb 2012 13:32

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