Which statement is true about stream ciphers?

A.
Messages are divided into blocks and encrypted

B.
They are better used in software compared to block ciphers

C.
They use a keystream generator to produce a stream of bits

D.
They carry out 16 rounds of computation

Explanation:
Keystream generators produce streams of bits that are then XORed with
the plaintext and the result is ciphertext. Block ciphers divide messages into
blocks and put each block through rounds of computation. Stream ciphers are best
used in hardware implementation.