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News Link • Surveillance

NSA man says agency can track you through POWER LINES

• theregister.co.uk

Forensics and industry experts have cast doubt on an alleged National Security Agency capability to locate whistle blowers appearing in televised interviews based on how the captured background hum of electrical devices affects energy grids.

Divining information from electrified wires is a known technique: Network Frequency Analysis (ENF) is used to prove video and audio streams have not been tampered with.

The technique works by analysing the nearly inaudible 50 Hertz energy hum generated by power grids which is inadvertently captured by most audio recording devices. Investigators could strip away layers of audio until the bare hum remains. That hum can then be scrutinised for unnatural variations.

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