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A cipher system is said to have perfect secrecy if

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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

I had been asked this question in exam.

This is a very interesting question from Cipher Systems and Secrecy of Cipher Systems in portion Spread Spectrum Techniques of Digital Communications

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Right choice is (a) Posteriori probability is equal to priori probability

For explanation: A cipher system is said to have perfect secrecy if for every message and cipher text the posteriori probability is equal to priori probability.

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