According to networking guru, George Ou from ZDNet, Sony Play Station Portable (PSP) is bad enough to ruin wireless Local Area Network (LAN) in the home, due to its lack of support to WiFi Protected Access (WPA) security.

Currently, Sony PSP supports only Wired Equivalent Privacy (WEP) encryption security for wireless LAN, but too bad this encryption technology was found to be completely broken five years ago.

The Wi-Fi Alliance in 2003 mandated that all Wi-Fi products comply with the new WPA standard and use the new TKIP encryption algorithm yet Sony somehow feels exempt from this responsibility.

So, for PSP user, they will have to lower their wireless LAN security to only support WEP instead of a more secure WPA, in order to connect using PSP. The following is one of the suggestions from George :

Sony needs to rectify the situation as soon as possible by retrofitting all new PSPs off the factory floor with WPA capability and offer a free upgrade to the PSPs that are already out in the wild.

[Source]