Some guys demonstrated how to crack a wireless network securing with 64bit WEP security in less than 10 minutes. They were using Whoppix 2.7 as the OS.

From the process of cracking, I don’t think it’s hard to learn. Just follow the steps and use some 3rd party WEP cracking applications.

So, my advice to those who is buying any wireless router, it’s better to go for wireless router with WPA security. :)