{
  "annotation_id": "510e754e-ac68-400c-89e6-128f8b02b8e8",
  "date_created": "2026-03-02T18:02:33.776000Z",
  "date_modified": "2026-03-02T18:02:33.776000Z",
  "file_hash": "8feb7c426e434dca76620b079dd1f59b5fedd6539c25b7e2e2c0ecc834ebdd05",
  "private": false,
  "record": {
    "abstract": "We analyzed the security of the secure direct communication protocol based on\nsecret transmitting order of particles recently proposed by Zhu, Xia, Fan, and\nZhang [Phys. Rev. A 73, 022338 (2006)], and found that this scheme is insecure\nif an eavesdropper, say Eve, wants to steal the secret message with Trojan\nhorse attack strategies. The vital loophole in this scheme is that the two\nauthorized users check the security of their quantum channel only once. Eve can\ninsert another spy photon, an invisible photon or a delay one in each photon\nwhich the sender Alice sends to the receiver Bob, and capture the spy photon\nwhen it returns from Bob to Alice. After the authorized users check the\nsecurity, Eve can obtain the secret message according to the information about\nthe transmitting order published by Bob. Finally, we present a possible\nimprovement of this protocol.",
    "arxiv_id": "quant-ph/0612016",
    "authors": [
      "Xi-Han Li",
      "Fu-Guo Deng",
      "Hong-Yu Zhou"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.74.054302",
    "journal_ref": "Phys. Rev. A 74, 054302 (2006)",
    "title": "Improving the security of secure direct communication based on secret   transmitting order of particles",
    "url": "https://arxiv.org/abs/quant-ph/0612016"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4bdba989-f91b-468a-be59-2ea9c273ea79",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}