ZyXEL Communications ZYAIR G-162 User Manual page 88

ZyXEL G-162 User's Guide
The encryption mechanisms used for WPA and WPA-PSK are the same. The only difference between the
two is that WPA-PSK uses a simple common password, instead of user-specific credentials. The common-
password approach makes WPA-PSK susceptible to brute-force password-guessing attacks but it's still an
improvement over WEP as it employs an easier-to-use, consistent, single, alphanumeric password.
User Authentication
WPA or WPA2 applies IEEE 802.1x and Extensible Authentication Protocol (EAP) to authenticate
wireless clients using an external RADIUS database.
If both an AP and the wireless clients support WPA2 and you have an external RADIUS server, use WPA2
for stronger data encryption. If you don't have an external RADIUS server, you should use WPA2 -PSK
(WPA2 -Pre-Shared Key) that only requires a single (identical) password entered into each access point,
wireless gateway and wireless client. As long as the passwords match, a wireless client will be granted
access to a WLAN.
If the AP or the wireless clients do not support WPA2, just use WPA or WPA-PSK depending on whether
you have an external RADIUS server or not.
Select WEP only when the AP and/or wireless clients do not support WPA or WPA2. WEP is less secure
than WPA or WPA2.
WPA(2)-PSK Application Example
A WPA(2)-PSK application looks as follows.
1. First enter identical passwords into the AP and all wireless clients. The Pre-Shared Key (PSK) must
consist of between 8 and 63 ASCII characters (including spaces and symbols).
2. The AP checks each wireless client's password and (only) allows it to join the network if the
password matches.
3. The AP derives and distributes keys to the wireless clients.
4. The AP and wireless clients use the TKIP or AES encryption process to encrypt data exchanged
between them.
DD Wireless LANs