Wireless = Not secure

The very first problem which any attacker faces is how to get physical access to the secure data. ANY wireless technology, solves this problem just by being switched on. If it radiates, you can sniff it.

Furthermore, the attacker can listen to gigs and gigs of traffic over a long period of time (in cryptanalytic terms) and can take a good guess at the nature of the data. He can then use it to work on the statistics.

Even the most sophisticated protocols will eventually crack under such scrutiny and with the trade-offs between speed and security needed for acceptable performance, wireless protocols are not all that sophisticated.

If you have really valuable data—I mean really, really valuable—don't use a wireless network and make sure your LAN/WAN is physically secure. Then you can start thinking about protocols.