ISC Exam Questions

The only cipher system said to be unbreakable by brute force is…

The only cipher system said to be unbreakable by brute force is

A.
AES

B.
DES

C.
One-time pad

D.
Triple DES

Explanation:
C: One-time pad is a key that is only used once and that must be as long as the plaintext but never repeats. Page 333.