He is using WEP 64 bit (Wired Equivalent Privacy) encryption on his wireless network as its wireless key is 10 digit alpha numeric key (ie: 1 to 9 and A to F ).
Is it recommended to use WEP on your Wi-Fi ?
WEP is the basic wireless encryption available now with high wireless performance and least wireless security. If you are really concerned about the security of your wireless network, you should not use WEP as your wireless encryption. It is proven that WEP is easy to break using small freebie software available in Internet. Using WEP 128 bit encryption is better than WEP 64 bit encryption but I recommend you to start using WPA (Wifi Protected Access) for your wireless network.
For more information about securing your wireless network click on the link below.
Secure your wireless network from hackers
WEP or WPA which is better or both are vulnerable ?
If you are worried about the security of your wifi network , WPA is far far better than WEP. It is heard that even WPA network is hacked in an experiment done by certain wireless security specialists. So what they suggest is forget about WEP and WPA.. if you really concern about security , upgrade your wifi security to WPA2 at-least. So in the hands of a crooked minded wifi hacker both WEP and WPA are useless.