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All Wi-Fi networks periodically broadcast beacons to announce their presence to nearby clients. These beacons contain various properties of the network, including dynamic information to manage the behavior of clients. We first show that an adversary can forge beacons to carry out various known as well as novel attacks. Motivated by these attacks, we propose a scheme to authenticate beacon frames that is efficient and has low bandwidth overhead. We evaluate the security properties of thisdoi:10.1145/3395351.3399442 dblp:conf/wisec/VanhoefAP20 fatcat:wyegey77djhjlhvsl4zoa3r3xy