{"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":"31f6ce19-6fda-4fbe-8816-7cc246bc813b","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"120851d0843b722a5f3234f478931f1045ecdfc31082bd6191b590d29e7fa36b","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:ripemd160:24]\nFind a collision for ripemd160 truncated to the first 48 bits (λ=24).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"ripemd160\",\"lambda\":24,\"inputA\":\"<hex 0x... or utf8>\",\"inputB\":\"<hex 0x... or utf8>\"}\nRules:\n- inputA and inputB must be distinct\n- digest(ripemd160, inputA) and digest(ripemd160, 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":"db8cf59269792af61e6af2b5ee3f86a9745dd031d74535fb14290fe873f6a5ff","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"31f6ce19-6fda-4fbe-8816-7cc246bc813b","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":"51493","feedbackHash":"560d2aab1ce8f423d26c2a94499e5026560e6c903c3b1853286cb2c5d996b0a6","nodeKey":"research_report","submissionHash":"120851d0843b722a5f3234f478931f1045ecdfc31082bd6191b590d29e7fa36b","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"916bfd3000162812011c70102802854364be1183892c5bf69beb11067739abbf","state":"completed","submissions":[{"artifacts":[{"bytes":3060,"hash":"749262f366f382eec7ed0b9d96e6962045de7182fafa6a850e0916ffcf54f195","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"4776869f8358bb2681f4b4e6524411b837047b6b8cc628d1883a8aa6d116f973","device":"74979c69cdd583ad","findings":[],"hash":"120851d0843b722a5f3234f478931f1045ecdfc31082bd6191b590d29e7fa36b","nodeId":"42edc20b-607d-411a-86a1-3f3b8a4aad62","outcome":"completed","summary":"I found a collision for RIPEMD-160 truncated to 48 bits, and the pair checks out under an independent recomputation. The deliverables are `collision.json` at the repo root and `artifacts/report.md`.\n\n| field | value |\n|---|---|\n| inputA | `0x0000000000de27bb` |\n| inputB | `0x000000000162a52d` |\n\nBoth digests start with `18573a938b62`, the same 48-bit prefix. The full digests are `18573a938b62f83d5fd18457e6667947098926a1` and `18573a938b62ac143bea6201e8a91fb007aa02ad`.\n\n- **Method:** I hashed 8-byte big-endian counters with `hashlib` and stopped at the first repeated 48-bit prefix. That took 23,242,030 evaluations, about two minutes on one core. The search script is `artifacts/find_collision.py`.\n- **Check:** A separate script re-read `collision.json`, hashed the hex-decoded bytes, and confirmed the inputs differ and the prefixes match.\n- **Choice I made:** The task allowed hex or UTF-8 but did not say which bytes get hashed. I chose hex-decoded bytes. If the verifier hashes the literal hex string, this pair will not work and the search would need to be rerun under that convention.\n- **Not verified:** I did not check against a second RIPEMD-160 implementation. The spec citation in the report is from memory, and I did not fetch it.\n\nThe new files are untracked, and I did not commit anything.","treeHash":"937e029284621a81c4ccd498b815dd3b612d1942","usage":{"cachedInputTokens":163614,"inputTokens":14,"model":"claude-sonnet-5","outputTokens":5135,"runtime":"claude","turns":8,"wallClockMs":146254}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"120851d0843b722a5f3234f478931f1045ecdfc31082bd6191b590d29e7fa36b","verifiedTreeHash":"937e029284621a81c4ccd498b815dd3b612d1942","verifierVersion":"0.1.0+41305fb5"}]}