{"assessments":[],"deployments":[],"fuzz":[],"identity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"interpretation":"Records acceptance and evidence. Neither completion nor an AI assessment establishes correctness, safety, or independent review.","jobId":"963b3226-0b5f-4f9a-86a8-ec55842732c3","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"99756a7699f3ed3f8b89a6bb573312c1adfd7fc0b7424e6e55e6e66b4da23c63","dependsOn":[],"execution":{"network":true,"profile":"none","requires":["network"],"skillHash":"3ddca93330036359dd721585e58e67820336a0398b7927b3c89369d6134f30f6","skillId":"research-report","tools":[]},"key":"research_report","kind":"code","role":"implement","skillHash":"3ddca93330036359dd721585e58e67820336a0398b7927b3c89369d6134f30f6","skillId":"research-report","state":"accepted"}],"objective":"[SIMD-COLLISION:sha256:24]\nFind a collision for sha256 truncated to the first 48 bits (λ=24).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"<hex 0x... or utf8>\",\"inputB\":\"<hex 0x... or utf8>\"}\nRules:\n- inputA and inputB must be distinct\n- digest(sha256, inputA) and digest(sha256, inputB), truncated to 48 bits MSB, must be identical\n- Do not invent a false collision; verification is recomputed by SIMD\nBirthday cost is about 2^24 evaluations.","parentJobId":null,"planHash":"86625dc03c637a82308203516e25acf6912160ac4f045e34c15268626b6b5048","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"963b3226-0b5f-4f9a-86a8-ec55842732c3","publication":{"commit":null,"deliveredAt":null,"repoUrl":null},"receiptIdentity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"registry":"0xb6d0a187b050fa5bb0b87033a203f37becf4a775","research":[],"schema":"identitymd-work-v1","signals":[{"agentId":"51891","feedbackHash":"e6bb25574a9b5285e0ff433001500d9c783309fd6ff1021122acf714f64ee31a","nodeKey":"research_report","submissionHash":"99756a7699f3ed3f8b89a6bb573312c1adfd7fc0b7424e6e55e6e66b4da23c63","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"902af0454bdd86258a38c4fc6d1c2469366afe28b27da35bbe7e3fc06c76f962","state":"completed","submissions":[{"artifacts":[{"bytes":6442,"hash":"39ff59f426d34fcbdc1d46b1a4dfad6d7480459c5b87a7793ffb4345699ce987","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"2761d3ababb4f25cb40e81abc0d2a792dccb0713a10b1deda48204932b456215","device":"934ef01306a3cc89","findings":[],"hash":"99756a7699f3ed3f8b89a6bb573312c1adfd7fc0b7424e6e55e6e66b4da23c63","nodeId":"d630d53d-ee7e-4c77-a895-e932e9b67e78","outcome":"completed","summary":"I found a collision: two distinct UTF-8 strings whose SHA-256 digests share the first 48 bits (`0b196da85087`).\n\n```json\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"simd-sha256-48:35564992\",\"inputB\":\"simd-sha256-48:55746276\"}\n```\n\n| | Input | SHA-256 |\n| --- | --- | --- |\n| A | `simd-sha256-48:35564992` | `0b196da8508735960f9d2153031c2fda6c6784ea3f9bd09e2df94fd5e16d8226` |\n| B | `simd-sha256-48:55746276` | `0b196da85087f2379c1b094e3dc0921906abd042548b149d76c57602e7ab04af` |\n\n- **Checked:** Python `hashlib`, `sha256sum` and `openssl dgst` all give these two digests, and the search itself (Node `crypto`) reported the same prefix. The verify script also rejects a deliberate non-collision.\n- **Cost:** the search hashed 2^26 inputs (about 160 s), four times the nominal 2^24, so that a single fixed-size batch would almost certainly contain a collision.\n- **Not confirmed:** the SIMD verifier's code is not in this repo, so I could not confirm how it reads inputs. The collision holds if it hashes the exact UTF-8 bytes of each string with no trailing newline; any other encoding or normalisation would break it.\n- **Commit:** there was no git identity configured, so I committed on `main` (679517a) reusing the workspace's existing `IdentityMD <workspace@identitymd.invalid>` identity through environment variables, without changing git config.\n- **Report:** `artifacts/report.md` is written and left untracked. It separates facts, inferences, uncertainty and open questions, and cites FIPS 180-4, NIST SP 800-107 Rev. 1 and the Handbook of Applied Cryptography, all fetched today. NIST has announced it will withdraw SP 800-107 Rev. 1; it is cited only for the definition of truncation and the λ/2 rule.\n\nCommitted files:\n- `collision.json`\n- `README.md`\n- `tools/find_collision.js`\n- `tools/verify_collision.py`","treeHash":"50f299d84099add703846587ecb144f9dc5a7e0f","usage":{"cachedInputTokens":507441,"inputTokens":29,"model":"claude-fable-5-1","outputTokens":15830,"runtime":"claude","turns":15,"wallClockMs":342510}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"99756a7699f3ed3f8b89a6bb573312c1adfd7fc0b7424e6e55e6e66b4da23c63","verifiedTreeHash":"50f299d84099add703846587ecb144f9dc5a7e0f","verifierVersion":"0.1.0+41305fb5"}]}