Implementation of a RADIUS server for access control through authentication in wireless networks

In this study, a remote authentication dial in user service (RADIUS) server was implemented, which offers a wireless security method based on registering users authorized to use the network. For this, a computer with 4GB of RAM and a fourth-generation i3 processor was used, mounted on the Ubuntu Server 18.04 operating system and using the free RADIUS open-source software. This server was connected to the network through the TL-WR940N router using the AES encryption method and the WPA2 – Enterprise wireless security protocol, which allows a RADIUS server to authenticate wireless users. Evaluating this method with three registered users, two of them administrators, and one guest, and a total of 8 wireless devices, the experimental results showed that, for the five failed attempts to enter the network, the RADIUS server was able to identify them with an accuracy of 100% in real-time. In addition, the two administrators' correct identification and subsequent access were achieved; one used the same credential to have another device connected to the network, so an identified user can connect to more than one device without creating other credentials. Finally, this security method was compared to WPA2 Personal for 4 hours, where it was verified that the RADIUS server maintains a maximum of 3 devices connected, while the second method allowed the entry of any device, whether or not it was foreign to the network, showing that the RADIUS server is a robust method with great potential to protect wireless networks.