Early WLAN security

Wireless local area networks (WLANs) transmit and receive using radio waves. Unlike wiring, it is easy for anyone to intercept these signals without needing to physically connect to your network, so security features are essential.

Early WLAN hardware used a number of security methods, including Service Set Identifiers (SSIDs), Media Access Control (MAC) and Wired Equivalent Privacy (WEP). SSIDs prevent connection to access points unless a device uses a given identifier correctly. MAC involves using addresses attached to each device to limit connection to access points. WEP uses encryption keys so that only devices with the correct key can communicate with access points.

WEP can still be found in many devices as users have found compatibility problems when introducing more advanced equipment. However, WEP has been proven to be ineffective against hackers and you should consider upgrading any devices relying on this technology.

Even when used in combination, these early security measures were insufficient to ensure confidentiality. Worse, equipment is often supplied with the security measures switched off. If these are not switched on then you have absolutely no security at all.If you are using a WLAN that relies on these techniques, you must ensure that they are correctly set up and working. If possible switch to more modern methods of security. See the page in this guide on WLAN security options