What block cipher mode of operation involves each ciphertext block being fed back into the encryption process to encrypt the next plaintext block?

Question

Group of answer choices

Cipher Block Chaining (CBC)

Electronic Code Book (ECB)

Galois/Counter (GCM)

Counter (CTR)

Answer 1

The block cipher mode of operation that involves each ciphertext block being fed back into the encryption process to encrypt the next plaintext block is Cipher Block Chaining (CBC).

In CBC mode, each plaintext block is XORed with the previous ciphertext block before being encrypted, which creates a dependency between the blocks. This helps to ensure that identical plaintext blocks will encrypt to different ciphertext blocks if they are positioned differently in the sequence.