Which one of the following algorithm is not used in asymmetric-key cryptography?

Which one of the following algorithm is not used in asymmetric-key cryptography?

Q. Which one of the following algorithm is not used in asymmetric-key cryptography?

A.            rsa algorithm

B.            diffie-hellman algorithm

C.            electronic code book algorithm

D.            dsa algorithm

Answer: electronic code book algorithm

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