Geodesic
On the reduction of key space for A5/1
Prikladnaâ diskretnaâ matematika, no. 12 (2010), pp. 21-23.

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We give a new way to reduce the size of key space of the stream cipher A5/1 that can be applied in cryptanalysis. 
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S. A. Kiselyov. On the reduction of key space for A5/1. Prikladnaâ diskretnaâ matematika, no. 12 (2010), pp. 21-23. http://geodesic.mathdoc.fr/item/PDM_2010_12_a8/

[1] Biryukov A., Shamir A., “Real Time Cryptanalysis of the Alleged A5/1 on a PC”, Preproc. FSE' 7, 2000, 1–18 | MR