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
Answer:A
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
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.