ksandaru / cryptography-a5-1-algorithm Goto Github PK
View Code? Open in Web Editor NEWA5/1 is a synchronous stream cipher based on linear feedback shift registers (LFSRs). It has a 64-bit secret key. A GSM conversation is transmitted as a sequence of 228-bit frames (114 bits in each direction) every 4.6 millisecond. Each frame is xored with a 228-bit sequence produced by the A5/1 running-key generator.