Bedienungsanleitung ZyXEL WAP6906 - AC3800 Tri-Band WiFi Repeater (Seite 77 von 99) (Englisch)

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Appendix A Wireless LANs

WAP6906 User’s Guide

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 re-authentication times out. A new WEP key is generated each

time re-authentication 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.

Note: EAP-MD5 cannot be used with Dynamic WEP Key Exchange

For added security, certificate-based authentications (EAP-TLS, EAP-TTLS and PEAP) use dynamic keys for

data encryption. They are often deployed in corporate environments, but for public deployment, a

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