In recent years, Wi-Fi technologies have become very popular and the trend is continuing to climb. Unfortunately, there is a risk to use Wi-Fi networks in range because there is no way to select trustworthy Wi-Fi networks. In this thesis, we focus on ways that can help users to choose the best Wi-Fi network for their needs. In order to help the user to choose the best network, our solution allows the users to rate the networks that they have used. It also checks that their assessments reflect the true network quality that they have experienced by measuring and certifying the quality of service such as delay, jitter and packet loss. The measuring process follows an innovative protocol that certifies the measurement in all cases but one. We mitigate this remaining case thanks to trust and reputation management.