Up until recently quantum cryptography thought to be secure to transmit cryptographic keys. Any attempt to eavesdrop the transmission could be easily detected (based on Heisenberg uncertainty principle). This was proved wrong by the team of researchers from the Norwegian University of Science and Technology (NTNU), the University of Erlangen-Nürnberg and the Max Planck Institute for the Science of Light in Erlangen. The team developed a quantum eavesdropping technique that remotely controls the photon detector. The researchers wrote that someone “can attack the systems with off-the-shelf components, obtaining a perfect copy of the raw key without leaving any trace of her presence.”
Vadim Makarov, one of the researchers, said that “The security loophole we have exposed is intrinsic to a whole class of single-photon detectors, regardless of their manufacturer and model.”
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