The State of Wireless LAN Security

In order to convince you that there are real issues to consider when
implementing your WLAN, it is important to focus on the integrated
security features present within 802.11b and their limitations.
802.11b offers features and functionality that provide you with greater
security in your wireless environment, however these security services
are enabled for the most part through the wired equivalent privacy
(WEP) mechanism to protect you at the link level during wireless transmissions
that take place between the client and the access point. Note
that WEP is not able to offer end-to-end security, but it does attempt to
secure the actual radio transmission by encrypting the data channel.