{"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":"74d65adb-0096-4f2c-a5d8-f4e2e89489ea","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"e54d10df787a3ad934dede4431ff63e5d53ed4a5d50b9f3c57aa6501b475e6d6","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":"74d65adb-0096-4f2c-a5d8-f4e2e89489ea","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":"51534","feedbackHash":"09b1efb87599bfdd5051721e20d6535f12f86ea6ecf8fcfee4dcdbcfc5785492","nodeKey":"research_report","submissionHash":"e54d10df787a3ad934dede4431ff63e5d53ed4a5d50b9f3c57aa6501b475e6d6","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"13eaae07d84e99cb9a2abb88bbcb15bf4a717a1441ac79f6897d79c5d8c4a5c8","state":"completed","submissions":[{"artifacts":[{"bytes":2891,"hash":"42503b7a84c074c461890ba9f6917423b8441630f3e45eebfa18382c7d0aeed6","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"77400331f445e3850c1b92bf458760934e5fe747ddd488541aff21f4ae47f880","device":"739094f0e08668ee","findings":[],"hash":"e54d10df787a3ad934dede4431ff63e5d53ed4a5d50b9f3c57aa6501b475e6d6","nodeId":"5df625f9-7fea-4899-bf36-99e042bcd13c","outcome":"completed","summary":"I found a 48-bit truncated SHA-256 collision and checked it with both Python `hashlib` and `sha256sum`; I could not run the SIMD verifier itself.\n\n```json\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"simd-3463940\",\"inputB\":\"simd-6587109\"}\n```\n\n| Input (UTF-8, no newline) | SHA-256 |\n|---|---|\n| `simd-3463940` | `3441ac04295a` `c59936fe…` |\n| `simd-6587109` | `3441ac04295a` `6cc87277…` |\n\nThe first 6 bytes of both digests are `3441ac04295a`; the digests differ after that, so this is a truncated collision only.\n\nThe search hashed the 2^25 strings `simd-0` … `simd-33554431` in about 38 seconds and found 5 colliding pairs; I used the one with the smallest index.\n\nTwo assumptions I could not confirm against the verifier:\n- **Input encoding:** the inputs are plain UTF-8 strings without a `0x` prefix. If the verifier wants hex, the same bytes are `0x73696d642d33343633393430` and `0x73696d642d36353837313039`.\n- **\"48 bits MSB\":** I read this as the first 6 bytes of the digest in its standard byte order.\n\nThe task gave no directory for `collision.json`, so it is committed at the repository root, along with `README.md` and `tools/find_collision.py`. The report is at `artifacts/report.md`, left untracked as required.","treeHash":"b1527436d83b216c7c701c9c7c6aea9882b03efe","usage":{"cachedInputTokens":109296,"inputTokens":10,"model":"claude-opus-5-5","outputTokens":4770,"runtime":"claude","turns":5,"wallClockMs":86308}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"e54d10df787a3ad934dede4431ff63e5d53ed4a5d50b9f3c57aa6501b475e6d6","verifiedTreeHash":"b1527436d83b216c7c701c9c7c6aea9882b03efe","verifierVersion":"0.1.0+41305fb5"}]}