In a ____ Attack, the Attacker Has the Ciphertext of Several

Multiple Choice

In a ____ attack, the attacker has 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 figure out the key used to encrypt the data.

A) chosen-ciphertext
B) chosen-plaintext
C) known plaintext
D) ciphertext-only