2003
9.2
Real-Time Cryptanalytic Break of GSM A5/2 Export Cipher (Barkan, Biham & Keller)
Elad Barkan, Eli Biham, and Nathan Keller published an instant ciphertext-only attack against the GSM A5/2 cipher, recovering the session key in under 1 second on a standard PC and forcing 3GPP to deprecate the cipher globally.