Acryptographic attack in which portions of the ciphertext are selected for trial decryption while
having access to the corresponding decrypted plaintext is known as what type of attack?

A.
Chosen ciphertext

B.
Adaptive chosen plaintext

C.
Known plaintext

D.
Chosen plaintext

Explanation:
The correct answer is “Chosen ciphertext. In answer Known plaintext, the attacker has a copy of the
plaintext corresponding to the ciphertext. Answer Chosen plaintext describes the situation where
selected plaintext is encrypted and the output ciphertext is obtained. The adaptive chosen plaintext
attack, answer “Adaptive chosen plaintext, is a form of chosen plaintext attack where the selection
of the plaintext is altered according to previous results.