- Password Authentication Protocol (PAP)
- Function: Provides identification and authentication of the user through static passwords.
- Security Concern: The user ID and password are not encrypted during communication, making them vulnerable to interception and replay attacks.
- Challenge Handshake Authentication Protocol (CHAP)
- Function: Utilizes a challenge/response dialog for authentication.
- Security Benefit: The challenge/response mechanism is non-replayable, which enhances security by preventing the reuse of captured credentials.
These protocols are used to secure remote access by authenticating users, with CHAP offering a more secure method compared to PAP due to its resistance to replay attacks.