Slid pairs in the initialisation of the A5/1 stream cipher

Alhamdan, Ali, Bartlett, Harry, Dawson, Ed , Simpson, Leonie, & Wong, Kenneth Koon-Ho (2013) Slid pairs in the initialisation of the A5/1 stream cipher. In Thomborson, Clark & Parampalli, Udaya (Eds.) Proceedings of the 11th Australasian Information Security Conference (AISC 2013), Australian Computer Society Inc., Adelaide, SA, pp. 3-12.

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A5/1 is a shift register based stream cipher which uses a majority clocking rule to update its registers. It is designed to provide privacy for the GSM system. In this paper, we analyse the initialisation process of A5/1. We demonstrate a sliding property of the A5/1 cipher, where every valid internal state is also a legitimate loaded state and multiple key-IV pairs produce phase shifted keystream sequences. We describe a possible ciphertext only attack based on this property.

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ID Code: 57633
Item Type: Conference Paper
Refereed: Yes
Keywords: A5/1, initialisation process, resynchronisation, slide attacks, stream cipher
ISBN: 9781921770234
ISSN: 1445-1336
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > NUMERICAL AND COMPUTATIONAL MATHEMATICS (010300) > Numerical and Computational Mathematics not elsewhere classified (010399)
Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > COMPUTATION THEORY AND MATHEMATICS (080200) > Analysis of Algorithms and Complexity (080201)
Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > COMPUTER SOFTWARE (080300) > Computer System Security (080303)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Electrical and Electronic Engineering not elsewhere classified (090699)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > Institutes > Institute for Future Environments
Current > Schools > School of Mathematical Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright,c, 2013, Australian Computer Society.
Copyright Statement: Reproduction for academic, not-for-profit purposes permitted provided the copyright text at the foot of the first page of each paper is included.
Deposited On: 26 Feb 2013 01:11
Last Modified: 13 Jun 2013 19:50

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