CHAP

From HostPedia

CHAP (Challenge Handshake Authentication Protocol) is a secure procedure for connecting to a system, it is considered a more secure version of PAP.

How CHAP works?

• After Connection was established, the server sends a "challenge message" to the computer/server who initiate the connection, which responds accordingly with a value obtained from a one way hash function.
• The server checks whether the value is correct (by calculating the value with the same hash function).
• If the values are a match, the authentication proccess have been completed, otherwise the connection will be terminated.