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802.1X-2001 defines two logical port entities for an authenticated port—the "controlled port" and the "uncontrolled port". The controlled port is manipulated by the 802.1X PAE (Port Access Entity) to allow (in the authorized state) or prevent (in the unauthorized state) network traffic ingress and egress to/from the controlled port.
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).
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.
On a Windows machine, taking an example of Windows 8, one should make sure to enable one's client to act as a supplicant by going to the Network Properties of the Network Interface Card (NIC), and from the Authentication tab, "Enable IEEE 802.1X authentication" need to be checked.
It is the default authentication method in Windows 2000 and later. The authentication process itself is much more complicated than in the previous protocols - Kerberos uses symmetric key cryptography, requires a trusted third party and can use public-key cryptography during certain phases of authentication if need be. [9] [10] [11]
IAS supports authentication for Windows-based clients, as well as for third-party clients that adhere to the RADIUS standard. IAS stores its authentication information in Active Directory, and can be managed with Remote Access Policies. IAS first showed up for Windows NT 4.0 in the Windows NT 4.0 Option Pack and in Microsoft Commercial Internet ...
The TKIP encryption algorithm was developed for WPA to provide improvements to WEP that could be fielded as firmware upgrades to existing 802.11 devices. The WPA profile also provides optional support for the AES-CCMP algorithm that is the preferred algorithm in 802.11i and WPA2. WPA Enterprise provides RADIUS based