Assuming wireless is required, the following results were found.

Wireless network security - worry about the right things
Wireless networks are now common in both domestic and commercial installations. Although wireless networking offers benefits such as portability and connection simplicity, the rich selection of security options can present a challenge for the average...
Bad security is worse than no security
Poor security can lend a false sense of security, encouraging you to relax your guard and making it more likely that you will suffer loss or damage from bad guys.

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