{"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":"0d57ec34-67f0-42a3-a5a3-d2c56ebf72dc","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"65a93ee07e1eedf4b9b4774ae75a831cc85884265de01b20f1cc3ec9efe4892e","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:keccak256:24]\nFind a collision for keccak256 truncated to the first 48 bits (λ=24).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"keccak256\",\"lambda\":24,\"inputA\":\"<hex 0x... or utf8>\",\"inputB\":\"<hex 0x... or utf8>\"}\nRules:\n- inputA and inputB must be distinct\n- digest(keccak256, inputA) and digest(keccak256, 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":"8ac951502b3ce9b5f98ad28015f6561157f756ecc5470fcb647a3f9e51c585aa","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"0d57ec34-67f0-42a3-a5a3-d2c56ebf72dc","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":"51045","feedbackHash":"234f202f6c5b58330cc577b484f2c12a8bd4a6fdaaedb9fb87e8bb4d3748f212","nodeKey":"research_report","submissionHash":"65a93ee07e1eedf4b9b4774ae75a831cc85884265de01b20f1cc3ec9efe4892e","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"55ceb0043f501296f0cacf1ff37a347002f2685b2f85ccef7d8fc269c5cf9171","state":"completed","submissions":[{"artifacts":[{"bytes":4076,"hash":"091740801c86bb7297cd60ad5becc7119dd7f612eb6d6eb4ed63e9d76ac2b4ad","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"2d073c2bf4c8c1152af35abffc6f488120c5a5a993a9baaeaf59854e2a4e4236","device":"630386aac053ef07","findings":[],"hash":"65a93ee07e1eedf4b9b4774ae75a831cc85884265de01b20f1cc3ec9efe4892e","nodeId":"6fcc57f4-894f-4450-971b-f32f8a7bd093","outcome":"completed","summary":"I found a collision. `collision.json` is in the repository root:\n\n```json\n{\"algo\":\"keccak256\",\"lambda\":24,\"inputA\":\"identitymd-7412922\",\"inputB\":\"identitymd-49446283\"}\n```\n\n| Input | keccak256 digest (first 48 bits in **bold**) |\n|---|---|\n| `identitymd-7412922` | **06f8602cde14**eaa97a7264115761fc9eebb12fcd6cb8080f1dd6134b7de84bc4 |\n| `identitymd-49446283` | **06f8602cde14**d101876298776c73b65f60c20eb683748c28de306acd36858d84 |\n\n**How it was checked:**\n- A C search program hashed 2^26 strings and sorted the 48-bit prefixes. It ran in about 2.5 minutes and found 5 colliding pairs; I submitted the first one. About 8 were expected at that sample size.\n- A separate pure-Python Keccak implementation, sharing no code with the C one, recomputed both digests. It also checked the JSON format and that the inputs differ. It reported that the first 48 bits match.\n- Both implementations reproduce the known Ethereum keccak256 results for `\"\"` and `\"abc\"`.\n\n**Main risk:** I took \"keccak256\" to mean the Ethereum version of the hash, which uses the original Keccak padding. If the checker actually uses NIST SHA3-256, this pair does **not** collide: SHA3-256 gives `c4630a5e…` and `d7490bb6…`. Re-running the search for SHA3-256 would take about 2 minutes. I also assumed the 48 bits are the first 6 bytes of the digest, and that inputs without a `0x` prefix are hashed as their UTF-8 bytes.\n\n**Delivered:**\n- Committed in a46793c: `collision.json`, the search program `tools/keccak256_birthday.c`, and the checker `tools/verify_collision.py`.\n- `artifacts/report.md` and `artifacts/README.md` are written and left uncommitted. A `.gitignore` rule ignores `artifacts/`, so I did not force-add them; the README is therefore not in the commit either. The report keeps confirmed facts, inferences and open questions separate, with sources and steps to reproduce.","treeHash":"3ee9da43e725b345e48f96b7a44a46585759321b","usage":{"cachedInputTokens":217048,"inputTokens":20,"model":"claude-opus-5-5","outputTokens":8735,"runtime":"claude","turns":12,"wallClockMs":234227}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"65a93ee07e1eedf4b9b4774ae75a831cc85884265de01b20f1cc3ec9efe4892e","verifiedTreeHash":"3ee9da43e725b345e48f96b7a44a46585759321b","verifierVersion":"0.1.0+41305fb5"}]}