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Related to EAP-TTLS: EAP-TLS


(Extensible Authentication Protocol) A protocol that acts as a framework and transport for other authentication protocols. EAP uses its own start and end messages, but then carries any number of third-party messages between the client (supplicant) and access control node such as an access point in a wireless network.

EAP and LANs

EAP originated with the dial-up PPP protocol in order to support protocols beyond PAP and CHAP. For use on packet networks, EAP Over LAN (EAPOL) was created. EAPOL added new message types and allowed an Ethernet header to be prefixed onto EAP messages so they could be transmitted via Ethernet. Following are various EAP methods used mostly in wireless networks, but also in wired networks. See 802.1X, WPA and 802.11i.

EAP-TLS (EAP-Transport Layer Security)
Uses the handshake protocol in TLS, not its encryption method. Client and server authenticate each other using digital certificates. Client generates a pre-master secret key by encrypting a random number with the server's public key and sends it to the server. Both client and server use the pre-master to generate the same secret key.

Like EAP-TLS above except only the server has a certificate to authenticate itself to the client first. As in EAP-TLS, a secure connection (the "tunnel") is established with secret keys, but that connection is used to continue the authentication process by authenticating the client and possibly the server again using any EAP method or legacy method such as PAP and CHAP.

PEAP (Protected EAP)
Similar to EAP-TTLS above except it does not support legacy methods. It only moves EAP frames. Windows XP natively supports PEAP.

LEAP (Light EAP, Cisco LEAP)
From Cisco, first implementation of EAP and 802.1X for wireless networks. Uses preshared keys and MS-CHAP protocol to authenticate client and server to each other. Server generates and sends session key to access point. Client computes session key independently based on data received in the CHAP challenge.

(EAP-Flexible Authentication via Secure Tunneling)
Enhancement to LEAP from Cisco that provides an encrypted tunnel to distribute preshared keys known as "Protected Access Credential" (PAC) keys. PAC keys may be continuously refreshed to prevent dictionary attacks. EAP-FAST is defined in Cisco's Cisco Compatible Extensions (see CCX).

EAP-SIM (GSM Cellphones)
For GSM phones that switch between cellular and Wi-Fi networks, depending on which is in range. The Subscriber Identity Module (SIM) smart card in the GSM phone (see GSM) contains the secret key used for challenge/response authentication and deriving session keys for encryption.
References in periodicals archive ?
Blake-Wilson, co-inventor of EAP-TTLS, one of the industry's most popular WLAN security solutions, will share his insights on how vendors develop security solutions.
Odyssey Client runs on Windows XP, 2000, 98, Me, Windows Mobile 2003 and Pocket PC 2002, and supports EAP-TTLS, EAP-PEAP, EAP-TLS, EAP-FAST, EAP-SIM, and LEAP authentication methods, and Wi-Fi Protected Access 2 (WPA2), Wi-Fi Protected Access (WPA), and dynamic WEP encryption protocols.
The building blocks now available to ThreadX customers for the creation of robust wireless designs include Interpeak's WiFi drivers, RADIUS client, L2TPv2/v3, VPN capabilities, Mobile IP products, and WPA/WPA2 Supplicant, which provides extensive support for EAP protocols (EAP-TLS, EAP-PEAP, EAP-MD5, EAP-TTLS, EAP-SIM, EAP-MSCHAPv2 and EAP-AKA).
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1x wireless LAN authentication compliant methods EAP-MD5, EAP-TLS, EAP-TTLS and MS-PEAP, WPA and WPA2 security to provide IT manager's access control and security for wireless LAN.
1x security standards, including Windows-standard EAP-TLS, EAP-TTLS, LEAP and PEAP for secure data transmission.
MatrixSSL provides an integral part of the PEAP, EAP-TLS, EAP-TTLS and EAP-FAST network authentication mechanisms that allow both wired and Wi-Fi devices to be authenticated on a network through a RADIUS server.