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Appendix D Wireless LANs

NBG4115 User’s Guide

250

EAP-MD5 (Message-Digest Algorithm 5)

MD5 authentication is the simplest one-way authentication method. The authentication server

sends a challenge to the wireless client. The wireless client ‘proves’ that it knows the password by

encrypting the password with the challenge and sends back the information. Password is not sent in

plain text.

However, MD5 authentication has some weaknesses. Since the authentication server needs to get

the plaintext passwords, the passwords must be stored. Thus someone other than the

authentication server may access the password file. In addition, it is possible to impersonate an

authentication server as MD5 authentication method does not perform mutual authentication.

Finally, MD5 authentication method does not support data encryption with dynamic session key. You

must configure WEP encryption keys for data encryption.

EAP-TLS (Transport Layer Security)

With EAP-TLS, digital certifications are needed by both the server and the wireless clients for

mutual authentication. The server presents a certificate to the client. After validating the identity of

the server, the client sends a different certificate to the server. The exchange of certificates is done

in the open before a secured tunnel is created. This makes user identity vulnerable to passive

attacks. A digital certificate is an electronic ID card that authenticates the sender’s identity.

However, to implement EAP-TLS, you need a Certificate Authority (CA) to handle certificates, which

imposes a management overhead.

EAP-TTLS (Tunneled Transport Layer Service)

EAP-TTLS is an extension of the EAP-TLS authentication that uses certificates for only the server-

side authentications to establish a secure connection. Client authentication is then done by sending

username and password through the secure connection, thus client identity is protected. For client

authentication, EAP-TTLS supports EAP methods and legacy authentication methods such as PAP,

CHAP, MS-CHAP and MS-CHAP v2.

PEAP (Protected EAP)

Like EAP-TTLS, server-side certificate authentication is used to establish a secure connection, then

use simple username and password methods through the secured connection to authenticate the

clients, thus hiding client identity. However, PEAP only supports EAP methods, such as EAP-MD5,

EAP-MSCHAPv2 and EAP-GTC (EAP-Generic Token Card), for client authentication. EAP-GTC is

implemented only by Cisco.

LEAP

LEAP (Lightweight Extensible Authentication Protocol) is a Cisco implementation of IEEE 802.1x.

Dynamic WEP Key Exchange

The AP maps a unique key that is generated with the RADIUS server. This key expires when the

wireless connection times out, disconnects or reauthentication times out. A new WEP key is

generated each time reauthentication is performed.

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