ISC2 Exam ISSAP Topic 2 Question 9 Discussion

encryption process, a block cipher might take an n bit block of plaintext as input, and output a corresponding n bit block of the ciphertext. The

exact transformation is controlled using a secret key. While decrypting, the decryption algorithm takes the n bit block of the ciphertext

together with the secret key, and yields the original n bit block of the plaintext.

Answer options B, C, and D are incorrect. All these three types of ciphers operate on an individual character or bit of a message.