Abstract
The stream cipher SNOW 3G designed in 2006 by ETSI/SA-GE is a base algorithm for the second set of 3GPP confidentiality and integrity algorithms. In this paper, we investigate the resynchronization security of a close variant of SNOW 3G, in which two modular additions are replaced by xors and which is called SNOW 3G ⊕ . It is shown that the feedback from the FSM to the LFSR is crucial for security. Given a pair of known IVs, the cipher without such a feedback is extremely vulnerable to differential known IV attacks with practical complexities (257 time and 233 keystream). With such a feedback, it is shown that 16 out of 33 initialization rounds can be broken by a differential chosen IV attack. This is the first public evaluation result for this algorithm.
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Biryukov, A., Priemuth-Schmid, D., Zhang, B. (2012). Differential Resynchronization Attacks on Reduced Round SNOW 3G ⊕ . In: Obaidat, M.S., Tsihrintzis, G.A., Filipe, J. (eds) e-Business and Telecommunications. ICETE 2010. Communications in Computer and Information Science, vol 222. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25206-8_9
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DOI: https://doi.org/10.1007/978-3-642-25206-8_9
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-25205-1
Online ISBN: 978-3-642-25206-8
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