Which of the following encryption is not based on Block Cipher?

A.
DES

B.
Blowfish

C.
AES

D.
RC4

Explanation:
RC4 (also known as ARC4 or ARCFOUR) is the most widely-used software stream cipher and is used in popular protocols such as Secure Sockets Layer (SSL) (to protect Internet traffic) and WEP (to secure wireless networks).

Topic 22, Penetration Testing Methodologies