Which of the following provides additional encryption strength by repeating the encryption process
with additional keys?

A.
AES

B.
3DES

C.
TwoFish

D.
Blowfish

Explanation:

Triple-DES (3DES) is a technological upgrade of DES. 3DES is still used, even though AES is the
preferred choice for government applications. 3DES is considerably harder to break than many
other systems, and it’s more secure than DES. It increases the key length to 168 bits (using three
56-bit DES keys).