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Improved cryptanalysis of the Common Scrambling Algorithm Stream Cipher

Simpson, Leonie R., Henricksen, Matthew, & Yap, Wun-She (2009) Improved cryptanalysis of the Common Scrambling Algorithm Stream Cipher. In Proceedings of the 14th Australasian Conference on Information Security and Privacy, 1-3 July 2009, Brisbane, Australia.

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Abstract

This paper provides a fresh analysis of the widely-used Common Scrambling Algorithm Stream Cipher (CSA-SC). Firstly, a new representation of CSA-SC with a state size of only 89 bits is given, a significant reduction from the 103 bit state of a previous CSA-SC representation. Analysis of this 89-bit representation demonstrates that the basis of a previous guess-and-determine attack is flawed. Correcting this flaw increases the complexity of that attack so that it is worse than exhaustive key search. Although that attack is not feasible, the reduced state size of our representation makes it obvious that CSA-SC is vulnerable to several generic attacks, for which feasible parameters are given.

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ID Code: 27578
Item Type: Conference Paper
Keywords: Digital Video Broadcasting, Common Scrambling Algorithm, Stream Cipher, Cryptanalysis
DOI: 10.1007/978-3-642-02620-1_8
ISBN: 9783642026195
ISSN: 0302-9743
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > DATA FORMAT (080400) > Data Encryption (080402)
Divisions: Past > Institutes > Information Security Institute
Copyright Owner: Copyright 2009 Springer
Copyright Statement: This is the author-version of the work. Conference proceedings published, by Springer Verlag, will be available via Lecture Notes in Computer Science http://www.springer.de/comp/lncs/
Deposited On: 28 Sep 2009 09:34
Last Modified: 29 Feb 2012 23:55

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