One of the biggest questions facing people trying to learn how to hack is "How do you practice without committing a felony?" Wi-Fi is one of the easiest things to break, but it still requires practice to be proficient. To practice, you can either go after a random Wi-Fi network or you can create your own target network. Using an old router is fine, but the passcode has to be changed manually. A Raspberry Pi was turned into a Wi-Fi access point using Hostapd. The goal was to create a hackable target that changes the access code every time it boots.
The Hostapd configuration file has an issue where you cannot store the WEP Key as a variable and then call that variable when the key is defined. This prevents urandom from being used to create a random key. A shell script was written to create the config file every time the Pi boots. This allows for the creation of a random key that can be inserted into the config file before hostapd loads. For verification purposes, the key is logged with creation date and time in a separate monitoring file.
To increase the training benefits of using the Pi platform, a web server was added and vulnerable web apps are hosted. This creates a training platform where both Wi-Fi and web app hacking can be practiced. The ultimate goal is to have a device where you break the Wi-Fi, gain root on the Pi, and force it to reboot. Once it reboots, a new passcode is in place, and the process must start all over. This way, the challenge stays fresh and engaging, and previously collected key material cannot be reused.