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Voice privacy in GSM cellular telephone protocol is provided by _______

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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

I had been asked this question during an online exam.

The question is from Cryptography in chapter Networking of Computer Network

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Right answer is (a) A5/2 cipher

The 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.

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