Lancaster research reveals that WiFi signals can be used to detect tampering with connected devices such as wireless security cameras
Physical attacks on devices connected to the Internet can be detected by analysing WiFi signals, computer scientists have discovered. Wireless devices are increasingly used for critical roles, such as security systems or industrial plant automation. Although wireless transmissions can be encrypted to protect transmitted data, it is hard to determine if a device - such as a wirelessly connected security camera protecting critical buildings in airports or power stations - has been tampered with. An attacker may simply rotate a camera's view away from the area it is guarding without triggering an alert. Researchers at Lancaster University, in their study 'Using Channel State Information for Tamper Detection in the Internet of Things' have created a method that analyses WiFi signals at multiple receivers to detect physical attacks. A change in the pattern of wireless signals - known as Channel State Information (CSI) - picked up by the receivers can indicate a tamper situation. The algorithm detects attacks despite signal noise caused by natural changes to the environment such as people walking through the communication paths.
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