{"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":"bd857866-e646-4dc7-b333-3a88305a23b4","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"f30830c0740dd4886b0f2dd095e27b03e8a747a049dc3ac12de857a3a5f43f52","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":"bd857866-e646-4dc7-b333-3a88305a23b4","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":"52145","feedbackHash":"48f3e8362c534cdd67aa4444fc15d8a8785ae4b1cb0e621a49e877caf292c1d1","nodeKey":"research_report","submissionHash":"f30830c0740dd4886b0f2dd095e27b03e8a747a049dc3ac12de857a3a5f43f52","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"a785e6a4219339a76e216f662fcff4c6ff03a45d1e50bb95dade65fac62e614b","state":"completed","submissions":[{"artifacts":[{"bytes":2508,"hash":"90e03d39b1f9cf7b5588bc73b3eea47bd8af0f37a467efb2f6946e27eb5f8b76","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"6b9bba486dbd0b6b96e199cbb7a8f06797b86a35f4d9634801d8cb572a69be21","device":"49d1d2fa353d99fb","findings":[],"hash":"f30830c0740dd4886b0f2dd095e27b03e8a747a049dc3ac12de857a3a5f43f52","nodeId":"232cde46-8b32-4556-ad27-771a605a4c53","outcome":"completed","summary":"I found a 48-bit collision for keccak256 and checked it with two separate implementations.\n\n**`collision.json`:**\n```json\n{\"algo\":\"keccak256\",\"lambda\":24,\"inputA\":\"imd-9804673\",\"inputB\":\"imd-17368822\"}\n```\n\nBoth inputs are UTF-8 strings. Their full digests share the first 48 bits, `2f72fe059bc2`:\n- `imd-9804673` → `2f72fe059bc2493e…2b7be703`\n- `imd-17368822` → `2f72fe059bc2f734…a5f1d550`\n\n**How it was found and checked:**\n- **Search:** `tools/collide.c` is a C birthday search. It found the match after 17,368,823 hashes (about 2^24), in about 96 s on one core. That is in line with the expected birthday cost of about 2.1·10^7.\n- **C check:** before the search, the C code reproduced the published Keccak-256 results for `\"\"` and `\"abc\"`.\n- **Python check:** `tools/verify.py` is a separate pure-Python Keccak. Its core function matches Python's built-in `hashlib.sha3_256`, and it reproduces the same two published results. Run on `collision.json`, it recomputed both digests and reported `48-bit prefix collision: True`.\n\n**Assumptions** (listed in `artifacts/report.md`):\n- **Hash variant:** \"keccak256\" here means the original Keccak padding used by Ethereum, not the standard SHA3-256. If the SIMD verifier actually computes SHA3-256, this pair will almost certainly not collide.\n- **Truncation:** \"first 48 bits MSB\" was read as the first 6 bytes of the digest.\n- **Input encoding:** inputs without a `0x` prefix are treated as UTF-8 text.\n\n`collision.json`, `README.md` and `tools/` are committed (2dc9e3b). Git had no author identity configured, so I set your name and email on that one commit only and did not change any git config. `artifacts/report.md` is left untracked for the daemon to upload; `artifacts/` is listed as ignored by Git.","treeHash":"626d98c076eeeaf6c5679b9ee948bafb765eafe0","usage":{"cachedInputTokens":163967,"inputTokens":14,"model":"claude-opus-5-5","outputTokens":6993,"runtime":"claude","turns":7,"wallClockMs":165847}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"f30830c0740dd4886b0f2dd095e27b03e8a747a049dc3ac12de857a3a5f43f52","verifiedTreeHash":"626d98c076eeeaf6c5679b9ee948bafb765eafe0","verifierVersion":"0.1.0+b4c7ae3a"}]}