In what type of attack does the attacker have the ciphertext of several messages that were encrypted with the same encryption algorithm,but has no access to the plaintext so he or she must try to calculate the key used to encrypt the data?
A) chosen-ciphertext
B) chosen-plaintext
C) known plaintext
D) ciphertext-only

Question

Quizplus · Accepted Answer

This scenario describes a ciphertext-only attack, where the attacker only has access to the encrypted messages and not the plaintext or any other information about the encryption process. The attacker must rely on cryptanalysis techniques to try and deduce the key used to encrypt the messages.

In What Type of Attack Does the Attacker Have the Ciphertext