Elliptic curve cryptosystems:

A.
Cannot be used to implement digital signatures.

B.
Have a higher strength per bit than an RSA.

C.
Cannot be used to implement encryption.

D.
Have a lower strength per bit than an RSA.

Explanation:
The correct answer is “Have a higher strength per bit than an RSA”. It is more difficult to compute
Elliptic Curve discreet logarithms than conventional discreet logarithms or factoring. Smaller key
sizes in the elliptic curve implementation can yield higher levels of security. Therefore, answer “Have
a lower strength per bit than an RSA” is incorrect. Answers “Cannot be used to implement digital
signatures” and “Cannot be used to implement encryption” are incorrect because elliptic curve
cryptosystems can be used for digital signatures and encryption.