You
are the Security Administrator for a consulting firm. One of your clients needs to encrypt traffic.
However, he has specific requirements for
the encryption algorithm. It must be a symmetric key block cipher. Which of the following should
you choose for this client?

A.
PGP

B.
SSH

C.
DES

D.
RC4

Explanation:
Data Encryption Standard (DES) is a symmetric key encryption algorithm that uses a 56
byte key and is a block cipher.

Answer option A is incorrect. PGP (Pretty Good Privacy) is a public key/asymmetric encryption
algorithm.