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This handshake is executed when a client wants to join a protected Wi-Fi network, and is used to confirm that both the client and access point possess the correct credentials (e.g. At the same time, the 4-way handshake also negotiates a fresh encryption key that will be used to encrypt all subsequent traffic.
Currently, all modern protected Wi-Fi networks use the 4-way handshake.
Note that if your device supports Wi-Fi, it is most likely affected.
During our initial research, we discovered ourselves that Android, Linux, Apple, Windows, Open BSD, Media Tek, Linksys, and others, are all affected by some variant of the attacks.
Concretely, attackers can use this novel attack technique to read information that was previously assumed to be safely encrypted.
This can be abused to steal sensitive information such as credit card numbers, passwords, chat messages, emails, photos, and so on.
Each time it receives this message, it will reinstall the same encryption key, and thereby reset the incremental transmit packet number (nonce) and receive replay counter used by the encryption protocol.
Once the key is installed, it will be used to encrypt normal data frames using an encryption protocol.For example, an attacker might be able to inject ransomware or other malware into websites.