What is CHAP (Challenge-Handshake Authentication Protocol)? CHAP (Challenge-Handshake Authentication Protocol) is a challenge and response authentication method that Point-to-Point Protocol (PPP) servers use to verify the identity of a remote user. CHAP authentication begins after the remote user initi...
Figure 22–2 CHAP Authentication Sequence Two peers that are about to initiate communications agree on a secret to be used for authentication during negotiation of a PPP link. The administrators of both machines add the secret, CHAP user names, and other CHAP credentials to the/etc/ppp/chap-se...
Challenge Handshake Authentication Protocol (CHAP). Also known as a three-way handshake, CHAP authentication relies on the client and server using an encrypted shared secret.Compared to PAP, CHAP authentication is considered more secure because it encrypts authentication exchanges and it can be configu...
Point-to-Point Protocol (PPP) authentication. EAP is utilized in PPP connections, such as dial-up and DSL connections, to authenticate users before granting network access. EAP methods like EAP-MD5 and EAP-MSCHAPv2 are commonly used in these scenarios to verify user identities and ensure secure...
LEAP is a Lightweight Extensible Authentication Protocol (LEAP) method that was developed by Cisco Systems. LEAP uses a modified version of MS-CHAP, an authentication protocol in which user credentials are not strongly protected and easily compromised. An exploit tool called ASLEAP was released in ...
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PEAP authentication is considered more secure than some other EAP methods because it protects the inner EAP conversation.
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PPP(Point-to-PointProtocol) is a common WAN data link layer protocol and is mainly used to encapsulate point-to-point data transmission on a full-duplex link. PPP provides thePAP(Password Authentication Protocol) andCHAP(Challenge Handshake Authentication Protocol). ...