A Tool Download It is called WiFiWay and is compatible with Linux. It is free and is in Spanish or English. It weighs 490 MB and is an excellent option to know if a WiFi network is secure or not.
This program is very good to make sure that we are connecting to a secure wireless network,is focused on analyzing all the WiFi networks you have available. No installation required, just burn the ISO image to a CD and boot the PC from there.
WiFiWay is a complete system specialized in security , which also has video tutorials on the official website to learn how to use it correctly, although it is not complicated, but it does require some basic knowledge of the subject.