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This impacts all Wi-Fi devices including laptops, notepads, phones, IoT devices like Televisions. The process starts when a device joins a protected Wi-Fi network and the four-way handshake takes place.
The handshake ensures that both the access point and the device have correct login credentials for the network and generates an encryption key for protecting the web traffic.
The encryption key is installed on the step three of the four-way handshake, but the access point will sometime resent the same key if it believes that the message may have been lost or dropped.