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Question

A cipher system is said to have perfect secrecy if

a.

Posteriori probability is equal to priori probability

b.

Posteriori probability is greater than priori probability

c.

Posteriori probability is less than priori probability

d.

None of the mentioned

Posted under Digital Communication

Answer: (a).Posteriori probability is equal to priori probability

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Q. A cipher system is said to have perfect secrecy if
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