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The RADIUS server then checks the user's identification against its database and
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grants or denies network access accordingly.
A 256-bit Pairwise Master Key (PMK) is derived from the authentication process by
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the RADIUS server and the client.
The RADIUS server distributes the PMK to the AP. The AP then sets up a key
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hierarchy and management system, using the PMK to dynamically generate
unique data encryption keys. The keys are used to encrypt every data packet that
is wirelessly communicated between the AP and the wireless clients.
Figure 26 WPA(2) with RADIUS Application Example
WPA(2)-PSK Application Example
A WPA(2)-PSK application looks as follows.
First enter identical passwords into the AP and all wireless clients. The Pre-Shared
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Key (PSK) must consist of between 8 and 63 ASCII characters or 64 hexadecimal
characters (including spaces and symbols).
The AP checks each wireless client's password and allows it to join the network
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only if the password matches.
The AP and wireless clients generate a common PMK (Pairwise Master Key). The
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key itself is not sent over the network, but is derived from the PSK and the SSID.
N220 User's Guide
Appendix A Wireless LANs
73
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