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    "story_id": "mp-2026-10-16-026",
    "source_story_id": "tmp-story-private-rag-random-projection",
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    "position": 15,
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    "section": "safety-security",
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    "headline": "A Random Projection Blurs the Store but Preserves the Search",
    "slug": "a-random-projection-blurs-the-store-but-preserves-the-search",
    "dek": "A shared projection of query and datastore embeddings offers a lightweight privacy baseline for retrieval-augmented generation.",
    "summary": "A shared projection of query and datastore embeddings offers a lightweight privacy baseline for retrieval-augmented generation.",
    "body_text": "Retrieval-augmented systems can expose sensitive material by making the datastore searchable through embeddings. This study applies the same random projection to stored and query vectors, aiming to preserve semantic similarity while making extraction harder. Across the evaluated RAG architectures and datasets, the authors report better retrieval and generation than the formal differential-privacy baselines they tested, with comparable empirical privacy under strong attacks. Random projection does not supply the same formal guarantee as differential privacy, and the paper does not establish resistance to every adversary. It does offer a simple baseline that teams can measure before accepting heavier privacy machinery.",
    "why_it_matters": "A shared projection of query and datastore embeddings offers a lightweight privacy baseline for retrieval-augmented generation.",
    "limitations": [
      "Random projection does not supply the same formal guarantee as differential privacy, and the paper does not establish resistance to every adversary."
    ],
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    "first_published_at": "2026-10-16T09:00:00.000-04:00",
    "modified_at": "2026-10-16T09:00:00.000-04:00",
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        "qualification": "Random projection does not supply the same formal guarantee as differential privacy, and the paper does not establish resistance to every adversary."
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    "source_ids": [
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    "tags": [
      "RAG",
      "privacy",
      "random projection"
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  "sources": [
    {
      "source_id": "source-2026-10-16-015",
      "title": "arXiv preprint 2610.22297, original v1",
      "publisher": "arXiv / submitting research authors",
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      "published_at": "2026-10-15T13:45:51.000-04:00",
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    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "A Random Projection Blurs the Store but Preserves the Search",
    "publisher": "The Machine Press",
    "published_at": "2026-10-16T09:00:00.000-04:00",
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