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In a WiFi network, all information which is sent over the network is broadcasted over the air. Usually network interfaces are configured to just ignore any network traffic not addressed to them, but there are tools available which change them to "promiscuous mode" which allows them to also log and show any traffic which they receive even though it is ...


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Your friend is likely using a network packets capture tool like wireshark or tcpdump to collect data that are transferred from and to your machine. At least to make it hard to your friend you have to use services or websites that offer data encryption which is commonly implemented using TLS, for instance when you are browsing a website make sure the website ...



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