CHAP (Challenge Handshake Authentication Protocol) uses a three-way handshake to authenticate users to a network, which involves periodic verification of a user's identity using a shared secret and a one-way hash function.
The authentication protocol that uses a three-way handshake to authenticate users to the network is CHAP (Challenge Handshake Authentication Protocol). This protocol periodically verifies the identity of the peer using a three-way handshake, this happens after the initial link establishment. When CHAP is used, the server sends a challenge message to the connection requester. The requester responds with a value calculated through a one-way hash function that includes a shared secret. The server checks this value by comparing it against its own calculation of the expected hash value. If the values match, the authentication is successful.