Locking of accessible information and implications for the security of quantum cryptography

Details Locking of accessible information and implications for the security of quantum cryptography Locking of accessible information and implications for the security of quantum cryptography

2005-12-02

arxiv.org/abs/quant-ph/0512021v2

Phys. Rev. Lett. 98, 140502 (2007)

Physics

Quantum Physics

5 pages; minor changes

Scientific paper

10.1103/PhysRevLett.98.140502

The unconditional security of a quantum key distribution protocol is often defined in terms of the accessible information, that is, the maximum mutual information between the distributed key S and the outcome of an optimal measurement on the adversary's (quantum) system. We show that, even if this quantity is small, certain parts of the key S might still be completely insecure when S is used in applications, such as for one-time pad encryption. This flaw is due to a locking property of the accessible information: one additional (physical) bit of information might increase the accessible information by more than one bit.

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