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  2. Challenge-Handshake Authentication Protocol - Wikipedia

    en.wikipedia.org/wiki/Challenge-Handshake...

    In computing, the Challenge-Handshake Authentication Protocol (CHAP) is an authentication protocol originally used by Point-to-Point Protocol (PPP) to validate users. CHAP is also carried in other authentication protocols such as RADIUS and Diameter. Almost all network operating systems support PPP with CHAP, as do most network access servers.

  3. Secure Socket Tunneling Protocol - Wikipedia

    en.wikipedia.org/wiki/Secure_Socket_Tunneling...

    It is fully integrated with the RRAS architecture in these operating systems, allowing its use with Winlogon or smart-card authentication, remote-access policies and the Windows VPN client. [4] The protocol is also used by Windows Azure for Point-to-Site Virtual Network. [5]

  4. OpenVPN - Wikipedia

    en.wikipedia.org/wiki/OpenVPN

    OpenVPN has several ways to authenticate peers with each other. OpenVPN offers pre-shared keys, certificate-based, and username/password-based authentication.Preshared secret key is the easiest, and certificate-based is the most robust and feature-rich.

  5. RADIUS - Wikipedia

    en.wikipedia.org/wiki/RADIUS

    RADIUS was developed by Livingston Enterprises in 1991 as an access server authentication and accounting protocol. It was later brought into IEEE 802 and IETF standards. RADIUS is a client/server protocol that runs in the application layer , and can use either TCP or UDP .

  6. MS-CHAP - Wikipedia

    en.wikipedia.org/wiki/MS-CHAP

    The protocol exists in two versions, MS-CHAPv1 (defined in RFC 2433) and MS-CHAPv2 (defined in RFC 2759).MS-CHAPv2 was introduced with pptp3-fix that was included in Windows NT 4.0 SP4 and was added to Windows 98 in the "Windows 98 Dial-Up Networking Security Upgrade Release" [1] and Windows 95 in the "Dial Up Networking 1.3 Performance & Security Update for MS Windows 95" upgrade.

  7. Authentication protocol - Wikipedia

    en.wikipedia.org/wiki/Authentication_protocol

    Password Authentication Protocol is one of the oldest authentication protocols. Authentication is initialized by the client sending a packet with credentials (username and password) at the beginning of the connection, with the client repeating the authentication request until acknowledgement is received. [6]

  8. Protected Extensible Authentication Protocol - Wikipedia

    en.wikipedia.org/wiki/Protected_Extensible...

    It then creates an encrypted TLS tunnel between the client and the authentication server. In most configurations, the keys for this encryption are transported using the server's public key. The ensuing exchange of authentication information inside the tunnel to authenticate the client is then encrypted and user credentials are safe from ...

  9. Diameter (protocol) - Wikipedia

    en.wikipedia.org/wiki/Diameter_(protocol)

    The Diameter protocol was initially developed by Pat R. Calhoun, Glen Zorn, and Ping Pan in 1998 to provide a framework for authentication, authorization, and accounting that could overcome the limitations of RADIUS. RADIUS had issues with reliability, scalability, security, and flexibility.