Zyxel-communications 70 Series Instrukcja Użytkownika Pobierz pdf (Strona 715)

ZyWALL 5/35/70 Series User’s Guide

715 Appendix H Wireless LANs

3 The wireless station replies with identity information, including username and password.

4 The RADIUS server checks the user information against its user profile database and

determines whether or not to authenticate the wireless station.

Types of Authentication

This section discusses some popular authentication types: EAP-MD5, EAP-TLS, EAP-

TTLS, PEAP and LEAP.

The type of authentication you use depends on the RADIUS server or the AP. Consult your

network administrator for more information.

EAP-MD5 (Message-Digest Algorithm 5)

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

sends a challenge to the wireless station. The wireless station ‘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 stations

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.

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