{
  "annotation_id": "7d5e7085-f08b-470c-92ea-488fe5933164",
  "date_created": "2026-03-02T18:02:23.730000Z",
  "date_modified": "2026-03-02T18:02:23.730000Z",
  "file_hash": "685233a0997b359709c0ae08e70f79b91d03242ca516cc1cf7f2b64ea19081fa",
  "private": false,
  "record": {
    "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"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "eee3e063-9263-4b67-9b9e-62e9e2ed5306",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}