Nowadays many activities of our daily lives are essentially based on the Internet. Information and services are available at every moment and they are just a click away. Wireless connections, in fact, have made these kinds of activities faster and easier. Nevertheless, security remains a problem to be addressed. If it is compromised, you can face severe consequences. When connecting to a protected Wi-Fi network a handshake is executed that provides both mutual authentication and session key negotiation. A recent discovery proves that this handshake is vulnerable to key reinstallation attacks. In response, vendors patched their implementations to prevent key reinstallations (KRACKs).