One type of network attack sends two different messages that use the same hash function to
generate the same message digest. Which network attack does this?

A.
Birthday attack.

B.
Brute force attack.

C.
Ciphertext only attack.

D.
Man in the middle attack.

Explanation:

A birthday attack is based on the principle that amongst 23 people, the probability of 2 of them
having the same birthday is greater the 50%. By that rational if an attacker examines the hashes
of an entire organizations passwords, they’ll come up with some common denominators.