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Kerberos

Another way to protect your wireless data is by using a technology called Kerberos. Created by MIT, Kerberos is a network authentication system based on key distribution. It allows entities that communicate over a wired or wireless network to prove their identity to each other while preventing eavesdropping or replay attacks. Kerberos also provides for data stream integrity (detection of modification) and secrecy (preventing unauthorized reading) using cryptography systems such as DES.

Kerberos works by providing principals (users or services) with digital tickets that they can use to identify themselves to the network and secret cryptographic keys for secure communications. A ticket is a sequence of a few hundred bytes that can be embedded in virtually any other network protocol, thereby allowing the processes implementing that protocol to be sure about the identity of the principals involved. After a client and server have used Kerberos to prove their identity, they can also encrypt all of their communications to assure privacy and data integrity as they go about their business.

Kerberos is available free from MIT and as a product from many different vendors.

Other security technologies include:

WPA (Wi-Fi Protected Access)
WPA2 (Wi-Fi Protected Access 2)
EAP (Extensible Authentication Protocol)
VPN (Virtual Private Network)
Firewalls
Media Access Control (MAC) Filtering
RADIUS Authentication and Authorization
802.1x and New Security Technologies