An attacker is trying to crack an encryption scheme in order to discover secret information. The attacker is able to get his own plaintext messages encrypted by the same mechanism used to protect the...

An attacker is trying to crack an encryption scheme in order to discover secret information. The attacker is able to get his own plaintext messages encrypted by the same mechanism used to protect the secret information he is trying to obtain. This method of attack is known as:

a. Chosen plaintext attack

b. Chosen ciphretext attack

c. Cryptanalysis

d. Man in the middle