{
  "abstract": "We construct efficient information-theoretic non-malleable codes for classical messages that are secure against two noncommunicating local quantum tampering operations with arbitrary pre-shared entanglement. For every sufficiently small fixed $ξ>0$ and all sufficiently large first-share lengths $n$, the codes have rate at least $1/5-ξ$, perfect correctness, and error $2^{-n^{Ω(1)}}$. Security holds for every message, with a single message-independent simulator for each attack. This resolves the constant-rate question for worst-case classical messages in the entangled two-split-state model. Our construction builds on the permutation-based two-split construction of Batra, Boddu, and Jain, which achieves rate approaching $1/5$ for uniformly random messages. We retain their architecture but replace the uniform message input to the permutation with a prescribed message concatenated with fresh uniform padding. Our main contribution is a worst-case security reduction for this modification.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39589",
  "author_total": 1,
  "authors": [
    {
      "name": "Naresh Goud Boddu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/feyf1cyny3fta.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39589",
  "fulltext_url": null,
  "id": "feyf1cyny3fta",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.39589",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cs.CR"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Cryptography and Data Security"
    ]
  ],
  "openalex": "W7215098834",
  "pdf_url": "https://arxiv.org/pdf/2609.39589",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/feyf1cyny3fta.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:49Z",
      "native_id": "2609.39589",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.39589"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Rate 1/5 Non-Malleable Codes against Entangled Split-State Tampering",
  "title_text": "Rate 1/5 Non-Malleable Codes against Entangled Split-State Tampering",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:49Z",
  "url": "https://research.draconitic.com/paper/feyf1cyny3fta",
  "venue": "arXiv",
  "versions": []
}