Which of the following is a problem with symmetric key encryption?

A.
Work factor is not a function of the key size.

B.
Most algorithms are kept proprietary.

C.
Secure distribution of the secret key.

D.
It is slower than asymmetric key encryption.

Explanation:
The correct answer is “Secure distribution of the secret key”. Answer “It is slower than asymmetric
key encryption” is incorrect because the opposite is true; answer “Most algorithms are kept
proprietary” is incorrect because most symmetric key algorithms are published; and answer “Work
factor is not a function of the key size” is incorrect because work factor is a function of key size. The
larger the key is, the larger the work factor.