The Linksys router admin tool should provide a means of securing the wireless connection. Typically you go to http://192.168.1.1 to log into the admin tool on the router. Check your documentation that came with the router, or if you don't have it, go to the Linksys web site and check their technical support pages.
Add WPA encryption instead of WEP (that can be cracked in less than one hour nowadays) PLUS use MAC address filtering. That should be enough security for a home network.
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