Which of the following levels of encryption is used by financial institutions throughout the world
and other customers with special permits?

A.
VPN

B.
VPN+DES

C.
Strong

Explanation:

: This is the correct answer, this kind of institutions need the integrity and authentication benefits
of a VPN, and also the privacy provided by an encryption algorithm like DES, or 3DES in case that

its necessary. With this answer we get three most important pillars of network security: Integrity
(Through digital signatures), Privacy (through encryption) and Authenticity (through
authentication).