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ZyAIR G-200 User’s Guide
2-14 Using the ZyAIR Utility
WPA-PSK Application Example
A WPA-PSK application looks as follows.
1. First enter identical passwords into the AP and all wireless clients. The Pre-Shared Key
(PSK) or Passphrase must consist of between 8 and 63 ASCII characters (including spaces
and symbols).
2. The AP checks each client’s password and (only) allows it to join the network if it
matches its password.
3. The AP derives and distributes keys to the wireless clients.
4. The AP and wireless clients use the TKIP encryption process to encrypt data exchanged
between them.
Figure 2-12 WPA - PSK Authentication
WPA with RADIUS Application Example
You need the IP address of the RADIUS server, its port number (default is 1812), and the
RADIUS shared secret. A WPA application example with an external RADIUS server looks as
follows. “A” is the RADIUS server. “DS” is the distribution system.
1. The AP passes the wireless client’s authentication request to the RADIUS server.
2. The RADIUS server then checks the user's identification against its database and grants or
denies network access accordingly.
3. The RADIUS server distributes a Pairwise Master Key (PMK) key to the AP that then sets
up a key hierarchy and management system, using the pair-wise key to dynamically generate
unique data encryption keys to encrypt every data packet that is wirelessly communicated
between the AP and the wireless clients.