The DES algorithm is an example of what type of cryptography?

A.
Secret Key

B.
Two-key

C.
Asymmetric Key

D.
Public Key

Explanation:
DES is a symmetric algorithm. This means that the same key is used for encryption and decryption. This is also
a definition for Secret Key cryptography.
Incorrect Answers:
B: This is not a valid cryptography term.
C: DES is a symmetric algorithm, and can therefore not be an example of Asymmetric Key cryptography.
D: Public Key cryptography makes use of asymmetric key algorithms, whereas DES is a symmetric algorithm.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 801, 831