Prisoners of their own device: Trojan attacks on device-independent quantum cryptography

Details Prisoners of their own device: Trojan attacks on device-independent quantum cryptography Prisoners of their own device: Trojan attacks on device-independent quantum cryptography

2012-01-20

arxiv.org/abs/1201.4407v3

Physics

Quantum Physics

6 pages, plus 3 of appendix. Additional discussions added. We wish to underline (in particular, for the benefit of any readers

Scientific paper

Device-independent quantum cryptographic schemes aim to guarantee security to users based only on the output statistics of any components used, and without the need to verify their internal functionality. Since this would protect users against untrustworthy or incompetent manufacturers, sabotage or device degradation, this idea has excited much interest, and many device-independent schemes have been proposed. We point out here a critical weakness of device-independent quantum cryptography protocols that rely on public communication between secure laboratories. Untrusted devices may record their inputs and outputs and reveal encoded information about them in their outputs during later runs. Reusing devices thus compromises the security of a protocol and risks leaking secret data. Immediate solutions include securely destroying used devices, or isolating them until previously generated data need no longer be kept secret. However, these solutions are costly and would impose severe constraints on the practicality of any protocol that is secure against an untrusted supplier. We briefly consider other possible defences available in scenarios where device reuse is restricted.

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