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EAP data is first encapsulated in EAPOL frames between the Supplicant and Authenticator, then re-encapsulated between the Authenticator and the Authentication server using RADIUS or Diameter. 802.1X authentication involves three parties: a supplicant, an authenticator, and an authentication server.
RADIUS is often the back-end of choice for 802.1X authentication. [2] A RADIUS server is usually a background process running on UNIX or Microsoft Windows. [1] The Blast-RADIUS attack breaks RADIUS when it is run on an unencrypted transport protocol like UDP. [3]
The Lightweight Extensible Authentication Protocol (LEAP) method was developed by Cisco Systems prior to the IEEE ratification of the 802.11i security standard. [3] Cisco distributed the protocol through the CCX (Cisco Certified Extensions) as part of getting 802.1X and dynamic WEP adoption into the industry in the absence of a standard.
MS-CHAP is used as one authentication option in Microsoft's implementation of the PPTP protocol for virtual private networks.It is also used as an authentication option with RADIUS [2] servers which are used with IEEE 802.1X (e.g., WiFi security using the WPA-Enterprise protocol).
A supplicant, in some contexts, refers to a user or to a client in a network environment seeking to access network resources secured by the IEEE 802.1X authentication mechanism. But saying "user" or "client" overgeneralizes; in reality, the interaction takes place through a personal computer , an Internet Protocol (IP) phone, or similar network ...
Internet Authentication Service in the Microsoft Windows 2000 Resource Kit; Article describing how to log IAS (RADIUS) + DHCP to SQL; Configure IAS RADIUS for secure 802.1x wireless LAN at archive.today (archived 2012-12-06) How to self-sign a RADIUS server for secure PEAP or EAP-TTLS authentication at archive.today (archived 2012-12-05)
EAP was originally developed for PPP(Point-to-Point Protocol) but today is widely used in IEEE 802.3, IEEE 802.11(WiFi) or IEEE 802.16 as a part of IEEE 802.1x authentication framework. The latest version is standardized in RFC 5247.
The eduroam service uses IEEE 802.1X as the authentication method and a hierarchical system of RADIUS servers. [13] The hierarchy consists of RADIUS servers at the participating institutions, national RADIUS servers run by the National Roaming Operators, and regional top-level RADIUS servers for individual world regions.