Radio bouncing of mutliple reflectors is a hard-to-defeat method of monitoring a weapons cache
A new technique devised by a team of researchers led by the Max Planck Institute for Security and Privacy aims to remotely monitor the removal of warheads stored in military bunkers. The scientists installed 20 adjustable mirrors and two antennae to monitor the movement of a blue barrel stored in a shipping container. One antenna emits radio waves that bounce off each mirror to create a unique reflection pattern detected by the other antenna.
The paper explains that the antenna-and-mirror technique doesn't require secure communication channels or tamper-resistant sensor hardware. The paper’s authors argue it is also"robust against major physical and computational attacks.
They could later ask the government controlling the nuclear stockpile to measure the radio wave signal recorded by its detector antenna and compare it to the initial result to check whether any warheads have been moved.
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