{"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":"9960035d-1f7f-445c-badb-d6945d97f01b","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"fe51593acd094f53a1e06c626c705bb06d519535faf77ee5c2aea97ecbf387d6","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":"9960035d-1f7f-445c-badb-d6945d97f01b","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":"51146","feedbackHash":"e8efcaf8d80655b681f2209b89294d7c9b5e03abef526c3179749a2f2c0399b1","nodeKey":"research_report","submissionHash":"fe51593acd094f53a1e06c626c705bb06d519535faf77ee5c2aea97ecbf387d6","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"39971e7081df0b93f11850d3bc1d6baa5741e6f845b58276067edf8add44d6cc","state":"completed","submissions":[{"artifacts":[{"bytes":3466,"hash":"a805b9283e2ff77dfaebbc8e412268a08f79ff667ffbcbacc229769936945538","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"f1d14bad3c9ca100a00fafea4c08674e9fadb4a54125116be4721b1f02dddd09","device":"824e6de6196c686f","findings":[],"hash":"fe51593acd094f53a1e06c626c705bb06d519535faf77ee5c2aea97ecbf387d6","nodeId":"c35257cc-c655-4651-aa57-8f514e37213a","outcome":"completed","summary":"I found a collision: the inputs `idmd-1974572` and `idmd-18504430` are different, but the first 48 bits of their keccak256 hashes match (`892154b32690`).\n\n- **inputA** `idmd-1974572` hashes to `892154b32690 03f016f7…`\n- **inputB** `idmd-18504430` hashes to `892154b32690 b9e1abdd…`\n\nOnly the truncated 48 bits collide; the full 256-bit hashes differ after that point.\n\n`collision.json` contains exactly the requested fields:\n```json\n{\"algo\":\"keccak256\",\"lambda\":24,\"inputA\":\"idmd-1974572\",\"inputB\":\"idmd-18504430\"}\n```\n\n**How I checked it:**\n- **Correct hash variant:** Node only has the standard SHA3-256, which pads differently from keccak256, so I wrote my own keccak256 (Ethereum's version) in `artifacts/keccak.js`. It gives the published answers for `\"\"`, `\"abc\"` and `\"hello world\"`.\n- **Search:** a straightforward birthday search found the collision after about 18.5 million hashes in roughly 5 minutes. That fits the expected cost of about 21 million (≈1.25 × 2^24).\n- **Second opinion:** I hashed both inputs again with two outside libraries, `js-sha3` and `@noble/hashes`, installed in `/tmp` only. Both gave the same full hashes as mine.\n\n**Assumptions I couldn't confirm:**\n- **Text inputs:** the verifier is assumed to read both inputs as plain UTF-8 text with no added newline. Neither starts with `0x` or is valid hex, so that is the only sensible reading.\n- **Hash variant:** \"keccak256\" is assumed to mean Ethereum's Keccak, not standard SHA3-256. If the verifier uses SHA3-256, this pair would almost certainly not match.\n- **Verifier not run:** the official SIMD verifier hasn't been run, so all the checks above are my own.\n\n**Files:**\n- `collision.json` (repository root)\n- `artifacts/collision.json` (identical copy)\n- `artifacts/report.md` (separates facts, inferences and open questions)\n- `artifacts/README.md`\n- `artifacts/keccak.js`\n- `artifacts/find_collision.js`\n\nEverything is left uncommitted. The local git exclude file already ignores `artifacts/`, so `git status` lists only `collision.json` as new.","treeHash":"d298c0da0f9fc4b5ba1fa651af20103eb307e6cf","usage":{"cachedInputTokens":265187,"inputTokens":24,"model":"claude-opus-5-5","outputTokens":8753,"runtime":"claude","turns":14,"wallClockMs":409346}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"fe51593acd094f53a1e06c626c705bb06d519535faf77ee5c2aea97ecbf387d6","verifiedTreeHash":"d298c0da0f9fc4b5ba1fa651af20103eb307e6cf","verifierVersion":"0.1.0+41305fb5"}]}