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WPA | Computer Security

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Vulnerability: On-path attackers can learn the encryption keys from the handshake and decrypt messages (includes brute-forcing the password if they don’t know it already) Defense: WPA2-Enterprise Another implementation of the link layer is WiFi, which wirelessly connects machines in a LAN. Because it uses wireless connections over cellular networks, WiFi has some differences from wired Ethernet, but these are out of scope for this class. For the purposes of this class, WiFi behaves mostly like Ethernet, with the same packet format and similar protocols like ARP for address translation. To join a WiFi network, your computer establishes a connection to the network’s AP (Access Point). Generally the AP is continuously broadcasting beacon packets saying “I am here” and announcing the name of the network, also called the SSID (Service Set Identifier). When you choose to connect to a WiFi network (or if your computer is configured to automatically join a WiFi network), it will broadcast a re

WPA | Computer Security Skip to main content Menu Expand (external link) Document Search Copy Copied Computer Security 28. Wireless Local Networks: WPA2 28.1. Cheat sheet Layer: Link (2) Purpose: Communicate securely in a wireless local network Vulnerability: On-path attackers can learn the encryption keys from the handshake and decrypt messages (includes brute-forcing the password if they don’t know it already) Defense: WPA2-Enterprise 28.2. Networking background: WiFi Another implementation of the link layer is WiFi, which wirelessly connects machines in a LAN. Because it uses wireless conne

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