A5/1 Cryptanalysis Paper

[John Young]

Adi Shamir has provided "Real-Time Cryptanalysis of 
GSM's A5/1 on a PC, (Preliminary Draft)" by Alex Biryukov 
and Adi Shamir, December 9, 1999:

   http://cryptome.org/a5.ps (Postscript, 292K)