Distinguishing attack on SOBER-128 with linear masking

Cho, Joo Yeon & Pieprzyk, Josef (2006) Distinguishing attack on SOBER-128 with linear masking. Information Security and Privacy : Information Security and Privacy, 4058, pp. 29-39.

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We present a distinguishing attack against SOBER-128 with linear masking. We found a linear approximation which has a bias of 2^− − 8.8 for the non-linear filter. The attack applies the observation made by Ekdahl and Johansson that there is a sequence of clocks for which the linear combination of some states vanishes. This linear dependency allows that the linear masking method can be applied. We also show that the bias of the distinguisher can be improved (or estimated more precisely) by considering quadratic terms of the approximation. The probability bias of the quadratic approximation used in the distinguisher is estimated to be equal to O(2^− − 51.8), so that we claim that SOBER-128 is distinguishable from truly random cipher by observing O(2^103.6) keystream words.

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6 citations in Scopus
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4 citations in Web of Science®

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ID Code: 73406
Item Type: Journal Article
Refereed: Yes
Additional Information: Paper presented in the 11th Australasian Conference, ACISP 2006, Melbourne, Australia, July 3-5, 2006.
DOI: 10.1007/11780656_3
ISBN: 978-3-540-35459-8
ISSN: 1611-3349
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 07 Jul 2014 01:07
Last Modified: 07 Jul 2014 23:36

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