So they can listen to what you are typing and using similar techniques, they can also figure out what is being displayed on your monitor, but going the other way? That could be a bit of a trick. You can induce a signal in a wire. That's basically what radio and television broadcasting does, they are sending electromagnetic energy out through the air and wherever it impacts a metal object it is going to generate a small amount of electricity. Metal objects like radio and TV antennaes, which are connected to radio and TV receivers. These receivers are looking for a specific signal, teasing it out of all the surrounding noise, and then amplifying it enough so that it can be heard. But how much power would you need to induce a signal that would be strong enough to be detected by the transistors in a computer? Radio signals coming out of an antennae are measured in microvolts. Internal computer voltages are measured in, well, it used to be volts, but now it is more like tenths of a volt. Still, a tenth of a volt is a heck of a long way from a microvolt.
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Friday, January 18, 2013
Cyber Attack
So they can listen to what you are typing and using similar techniques, they can also figure out what is being displayed on your monitor, but going the other way? That could be a bit of a trick. You can induce a signal in a wire. That's basically what radio and television broadcasting does, they are sending electromagnetic energy out through the air and wherever it impacts a metal object it is going to generate a small amount of electricity. Metal objects like radio and TV antennaes, which are connected to radio and TV receivers. These receivers are looking for a specific signal, teasing it out of all the surrounding noise, and then amplifying it enough so that it can be heard. But how much power would you need to induce a signal that would be strong enough to be detected by the transistors in a computer? Radio signals coming out of an antennae are measured in microvolts. Internal computer voltages are measured in, well, it used to be volts, but now it is more like tenths of a volt. Still, a tenth of a volt is a heck of a long way from a microvolt.
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