Which of the following would provide the STRONGEST encryption?

A.
Random one-time pad

B.
DES with a 56-bit key

C.
AES with a 256-bit key

D.
RSA with a 1024-bit key

Explanation:
One-time pads are the only truly completely secure cryptographic implementations.
They are so secure for two reasons. First, they use a key that is as long as a plaintext message. That
means there is no pattern in the key application for an attacker to use. Also, one-time pad keys are used
only once and then discarded. So even if you could break a one-time pad cipher, that same key would
never be used again, so knowledge of the key would be useless.Incorrect Answers:
B, C, D: DES; AES, and RSA are less secure than one-time pads.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 250, 251, 252