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.