The 64-bit encryption method used by GSM networks (AT&T/TMobile/etc), known as A5/1 has been theoretically crackable for 10 years now, but it was very expensive to do so. At Black Hat D.C. 2008 however, a $1,000 solution was unveiled that claims to crack it in 30 minutes, or for $100,000 it can be cracked in 30 seconds.
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