Question 1a: What is the only cryptosystem known to be unbreakable, when correctly implemented?

a) substitution ciper b) transposition ciper c) advanced encryption standard d) one-time pad e) none

Quetion 1b: Cipher types which operates on large pieces of a message rather than individual characteers or bits of a message?

a) Caesar Ciper b) stream Ciper c) block Ciper d) ROT3 Ciper e) none of the above