Yes, they can be highly secure depending on how you set them up. WLANs have DSSS (Direct Sequence Spread Spectrum) technology on the hardware side and WEP (Wired Equivalent Privacy) on the software side. There are also many different ways to secure your network, refer to our tutorial on Setting up a Wireless Network:

http://www.5starsupport.com/tutorial/wireless.htm#securing

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