Of the following choices, which is more suitable for a hardware implementation?

A.
Stream ciphers

B.
Block ciphers

C.
Cipher block chaining

D.
Electronic code book

Explanation:
A stream cipher treats the message as a stream of bits or bytes and
performs mathematical functions on them individually. The key is a random value
input into the stream cipher, which it uses to ensure the randomness of the
keystream data. Stream cyphers are more suitable for hardware implementations
because they encrypt and decrypt one bit at a time.