Question

Equivocation is the

(a) Joint probability of X and Y

(b) Conditional probability of X given Y

(c) Conditional probability of Y given X

(d) None of the mentioned

The question was asked in quiz.

This intriguing question comes from Cipher Systems and Secrecy of Cipher Systems topic in section Spread Spectrum Techniques of Digital Communications

Answer 1

The correct option is (b) Conditional probability of X given Y

For explanation I would say: Equivocation is defined as the conditional probability of X given Y.