If different keys generate the same ciphertext for the same message, what is this called?
A.
Collision
B.
Secure hashing
C.
MAC
D.
Key clustering
Explanation:
Message A was encrypted with key A and the result is ciphertext Y. If
that same Message A was encrypted with key B the result should not be ciphertext Y.
The ciphertext should be different since a different key was used. But if this does
take place it is referred to as key clustering.