[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"branding":3,"analytics":7,"article-microsoft-proposes-a-cryptographic-way-to-prove-llm-ownership":10,"sections":34},{"siteName":4,"siteTagline":5,"publisherName":4,"contactEmail":6},"The Revision","Tech news, decoded.","editor@therevision.news",{"gaMeasurementId":8,"adsenseClientId":9},"G-ZW2MV82GYR","ca-pub-8533917693782264",{"article":11},{"id":12,"slug":13,"title":14,"dek":15,"body_md":16,"tags_json":17,"published_at":18,"created_at":19,"updated_at":20,"status":21,"review_note":22,"review_notes":23,"image_url":22,"persona_id":22,"persona_name":22,"section":24,"tags":25,"sources":29,"feedback":33,"feedback_at":22,"cost_usd":33,"total_tokens":33},3322,"microsoft-proposes-a-cryptographic-way-to-prove-llm-ownership","Microsoft Proposes a Cryptographic Way to Prove LLM Ownership","A new fingerprinting framework ties model outputs to cryptographic proofs, aiming to make AI model theft easier to detect and prosecute.","A research team has built a cryptographic fingerprinting system designed to prove when a large language model has been copied or misused.\n\nThe technique, called Chain and Hash, embeds fingerprint prompts into a model during training and then cryptographically links those prompts to their expected responses. If someone takes the model, fine-tunes it, or strips out identifiers, the fingerprint is supposed to survive. The researchers identify five properties a fingerprint must have to be useful — transparency, efficiency, persistence, robustness, and unforgeability — and argue their method satisfies all five. They also tested against a specific attack vector: using meta-prompts to shift a model's output style enough to obscure a fingerprint. Random padding and varied meta-prompt configurations during training appear to close that gap.\n\nModel theft is a real and growing problem as frontier models become more valuable — fine-tuned derivatives and leaked weights are already circulating, and current ownership claims rely mostly on legal agreements rather than technical proof. A cryptographic method that survives fine-tuning would shift that balance, giving companies something to point at in court beyond a terms-of-service violation. The framework also covers LoRA adapters, the lightweight fine-tuning technique widely used to customize open-source models.\n\nThe code is public on GitHub under Microsoft's account, which makes this easy to evaluate — and easy to attack. How long the fingerprint holds against a motivated adversary with full model access remains the real test.","[\"ai\",\"security\",\"llm\",\"open-source\"]","2026-07-02T04:00:00.000Z","2026-07-02T07:21:23.053Z","2026-07-02T07:21:25.969Z","published",null,[],"ai",[24,26,27,28],"security","llm","open-source",[30],{"name":31,"url":32},"arXiv cs.AI","https:\u002F\u002Farxiv.org\u002Fabs\u002F2407.10887",0,{"sections":35},[36,40,44,49,54,59,64,69,74,79,84,88,93,98],{"name":37,"slug":24,"count":38,"latest_published_at":39},"AI",2590,"2026-07-16T04:00:00.000Z",{"name":41,"slug":26,"count":42,"latest_published_at":43},"Security",294,"2026-07-15T19:59:48.000Z",{"name":45,"slug":46,"count":47,"latest_published_at":48},"Deals","deals",179,"2026-06-29T20:02:07.000Z",{"name":50,"slug":51,"count":52,"latest_published_at":53},"Policy","policy",158,"2026-07-16T00:02:48.000Z",{"name":55,"slug":56,"count":57,"latest_published_at":58},"Hardware","hardware",122,"2026-07-14T19:46:26.000Z",{"name":60,"slug":61,"count":62,"latest_published_at":63},"Consumer Tech","consumer-tech",93,"2026-07-13T13:20:48.000Z",{"name":65,"slug":66,"count":67,"latest_published_at":68},"Software","software",70,"2026-07-13T19:52:25.000Z",{"name":70,"slug":71,"count":72,"latest_published_at":73},"Science","science",66,"2026-07-10T10:29:37.000Z",{"name":75,"slug":76,"count":77,"latest_published_at":78},"Dev Tools","dev-tools",59,"2026-07-07T04:00:00.000Z",{"name":80,"slug":81,"count":82,"latest_published_at":83},"Gaming","gaming",41,"2026-07-09T04:00:00.000Z",{"name":85,"slug":86,"count":82,"latest_published_at":87},"Startups","startups","2026-06-29T20:55:50.000Z",{"name":89,"slug":90,"count":91,"latest_published_at":92},"General","general",29,"2026-07-10T22:28:58.000Z",{"name":94,"slug":95,"count":96,"latest_published_at":97},"Reviews","reviews",20,"2026-06-24T12:00:01.000Z",{"name":99,"slug":100,"count":101,"latest_published_at":102},"How-To","how-to",6,"2026-06-16T09:00:00.000Z"]