Which of the following protects a password from eavesdroppers and supports the encryption of communication? 

Answer options:

A. Challenge Handshake Authentication Protocol (CHAP)
B. Challenge Handshake Identification Protocol (CHIP)
C. Challenge Handshake Encryption Protocol (CHEP)
D. Challenge Handshake Substitution Protocol (CHSP) A

Explanation

CHAP: A protocol that uses a three way hanbdshake The server sends the client a challenge which includes a random value(a nonce) to thwart replay attacks. The client responds with the MD5 hash of the nonce and the password. The authentication is successful if the client`s response is the one that the server expected. Reference: Page 450, OIG 2007. CHAP protects the password from eavesdroppers and supports the encryption of communication. Reference: KRUTZ, Ronald L. & VINES, Russel
D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 44.