“Security researchers have successfully broken one of the most secure encryption algorithms, 4096-bit RSA, by listening – yes, with a microphone — to a computer as it decrypts some encrypted data. The attack is fairly simple and can be carried out with rudimentary hardware. In this case, the security researchers listen to the high-pitched (10 to 150 KHz) sounds produced by your computer as it decrypts data.  The researchers successfully extracted decryption keys over a distance of four meters (13 feet) with a high-quality parabolic microphone. They also managed to pull of this attack with a smartphone placed 30 centimeters (12 inches) away from the target laptop.”

http://www.extremetech.com/extreme/173108-researchers-crack-the-worlds-toughest-encryption-by-listening-to-the-tiny-sounds-made-by-your-computers-cpu

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