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

Explanation: The A5/2 cipher was published in the year 1996 and was cryptanalysed in the same year within a month. It’s use was discontinued from the year 2006 as it was really weak.

Occurrence: 0, System Administrator 2026