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.
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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