Cryptography Teacher Question:

Voice privacy in GSM cellular telephone protocol is provided by:
A. A5/2 cipher B. b5/4 cipher C. b5/6 cipher D. b5/8 cipher

A. A5/2 cipher

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A straight permutation cipher or a straight P-box has same number of inputs as cipher Frames Outputs Bits	In cryptography, what is cipher? A. algorithm for performing encryption and decryption B. encrypted message C. both (a) and (b) D. none of the mentioned