Do you remember the sounds your v.92 dial-up modem used to make? Those screeches, whistles, and buzzes were the sounds of your information traveling across the phone line to your ISP. Theoretically, you could tap your phone line, record the entire phone call to a wav file, and write a computer program to convert the sound waves into a pcap file.
Now, let’s take that a step further. If you can turn audio into a pcap file, then you should be able to reverse the process and transmit information as well. If you can get this process to work in real-time, you could design a MitM system with nothing but a sound card and a sufficiently fast computer!
But why stop there? Caller ID may not use v.92, but it still ...
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