A linear cryptanalysis attack is considered what type of attack?

A.
Ciphertext only

B.
Known-plaintext attack

C.
Known-ciphertext attack

D.
Chosen plaintext attack

Explanation:
The attacker carries out a known-plaintext attack on several different
messages encrypted with the same key. The more messages that the attacker can
uncover and put through this type of attack will yield a higher confidence in the
probability of a specific key value. The attacker will evaluate the input and output
values for each S-box. He evaluates the probability of input values ending up in a
specific combination. Identifying specific output combinations allows him to assign
probability values to different keys until one shows a continual pattern of having
the highest probability.