Using a Smartphone’s Microphone and Speakers to Eavesdrop on Passwords

It’s amazing that this is even possible: "SonarSnoop: Active Acoustic Side-Channel Attacks": Abstract: We report the first active acoustic side-channel attack. Speakers are used to emit human inaudible acoustic signals and the echo is recorded via microphones, turning the acoustic system of a smart phone into a sonar system. The echo signal can be used to profile user interaction with… Continue reading Using a Smartphone’s Microphone and Speakers to Eavesdrop on Passwords