New technique can spy on your security cameras through walls

The technique, called EM Eye, uses a radio antenna to pick up the electromagnetic radiation emitted by the wires inside the cameras.Get a daily digest of the latest news in tech, science, and technology, delivered right to your mailbox. Subscribe now.

The researchers say that the technique exposes a flaw in how cameras are designed and manufactured. Most cameras focus on protecting the intentional digital interfaces, such as the upload channel to the cloud, but neglect the leakage of information through unintended channels, such as the wires. The technique is based on the principle of electromagnetic induction, which states that a changing magnetic field can induce an electric current in a conductor. The wires inside the cameras are conductors that carry the electric current of the video data. When this current changes, it creates a magnetic field that can be detected by a radio antenna.

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