ZyXEL Communications Network Card unified security gateway Manuel d'utilisateur télécharger pdf (Page 811)

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Appendix C Wireless LANs

ZyWALL USG 20/20W User’s Guide

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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.

If this feature is enabled, it is not necessary to configure a default encryption key

in the wireless security configuration screen. You may still configure and store

keys, but they will not be used while dynamic WEP is enabled.

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