the output of the encryption function is fed back to the shift register in Output Feedback mode, whereas in ___________ the ciphertext unit is fed back to the shift register.
A)Cipher Block Chaining mode
B)Electronic Codebook mode
C)Cipher Feedback mode
D)Counter mode

Question

Quizplus · Accepted Answer

In Cipher Feedback (CFB) mode, the ciphertext unit is fed back into the shift register, unlike Output Feedback (OFB) mode where the output of the encryption function is fed back.

The Output of the Encryption Function Is Fed Back to the Shift