Both __________ produce output that is independent of both the plaintext and the ciphertext.This makes them natural candidates for stream ciphers that encrypt plaintext by XOR one full block at a time.
A)CBC and ECB
B)OFB and CTR
C)ECB and OFB
D)CTR and CBC

Question

Quizplus · Accepted Answer

OFB (Output Feedback) and CTR (Counter) modes of operation produce output that is independent of both plaintext and ciphertext, making them suitable for use with stream ciphers that encrypt plaintext by XORing one full block at a time. CBC (Cipher Block Chaining) and ECB (Electronic Codebook) modes of operation, on the other hand, are not suitable for use with stream ciphers because they both require the previous ciphertext block to be used in the encryption of the current block.

Both __________ Produce Output That Is Independent of Both the Plaintext