Most wireless cards support Wired Equivalent Privacy (WEP) encryption, so, at a minimum, this should be your choice. However, bad guys can now crack WEP. Even so, having WEP is better than not having any encryption. If a criminal sees some encryption, even WEP, chances are he'll pursue someone else without it. Choose WEP, enter a pass phrase (such as CNET#1) then hit Generate; Linksys creates all the WEP keys for you. Remember to Save Settings before continuing. If you have newer hardware around the house, you'll want the more secure WPA instead. Read on.