![]() ![]() Next will be shown two examples of capturing Wi-Fi traffic and its decryption. But to use the captured handshake you need a password of the Wi-Fi network.ġ) a handshake that occurred between the Client and the Access Point immediately prior to the exchange of decrypted informationĢ) password to connect to the Access Point ![]() And not any, but exactly the one that happened to transmit the traffic that needs to be decrypted. The main thing you need to understand: to decrypt Wi-Fi traffic, you need a four-way handshake. To calculate PTK, you need data from a four-way handshake, as well as a password of a Wi-Fi network (in fact, you also need other information, such as the network name (SSID), but obtaining this data is not a problem). Thus, it turns out that Wi-Fi traffic for each connection in the same Access Point is encrypted with different PTKs, and even for the same Client after reconnecting PTK changes. At the same time, PTK is dynamic, that is, it is created anew for each new connection. When transmitting via Wi-Fi, the traffic is encrypted using PTK (the Pairwise transient key). Let's start with the theory in order to understand why the process of decrypting Wi-Fi traffic in Wireshark requires some effort and why one cannot just decrypt any captured Wi-Fi traffic even if one has a password from the Access Point.
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