dorsal/arxiv
View SchemaLocking of accessible information and implications for the security of quantum cryptography
| Authors | Robert Koenig, Renato Renner, Andor Bariska, Ueli Maurer |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0512021 |
| URL | https://arxiv.org/abs/quant-ph/0512021 |
| DOI | 10.1103/PhysRevLett.98.140502 |
| Journal | Phys. Rev. Lett. 98, 140502 (2007) |
Abstract
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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"abstract": "The unconditional security of a quantum key distribution protocol is often\ndefined in terms of the accessible information, that is, the maximum mutual\ninformation between the distributed key S and the outcome of an optimal\nmeasurement on the adversary\u0027s (quantum) system. We show that, even if this\nquantity is small, certain parts of the key S might still be completely\ninsecure when S is used in applications, such as for one-time pad encryption.\nThis flaw is due to a locking property of the accessible information: one\nadditional (physical) bit of information might increase the accessible\ninformation by more than one bit.",
"arxiv_id": "quant-ph/0512021",
"authors": [
"Robert Koenig",
"Renato Renner",
"Andor Bariska",
"Ueli Maurer"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.98.140502",
"journal_ref": "Phys. Rev. Lett. 98, 140502 (2007)",
"title": "Locking of accessible information and implications for the security of quantum cryptography",
"url": "https://arxiv.org/abs/quant-ph/0512021"
},
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