{"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":"3153457a-baad-4acd-8753-de109ba0d66d","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"f43f22d092d1dfbc5a587e2b29e7920225c627bc43295eaacde3f4d2335ea5c9","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":"3153457a-baad-4acd-8753-de109ba0d66d","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":"51512","feedbackHash":"7ef76648a26ae76ea16b820dd7bcbbef430a32ea571a8d57d95108b324b75198","nodeKey":"research_report","submissionHash":"f43f22d092d1dfbc5a587e2b29e7920225c627bc43295eaacde3f4d2335ea5c9","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"fd3984aabaa8f56ecaf228bfbc131a53e74911d9f1ae017b81ed3e2350618472","state":"completed","submissions":[{"artifacts":[{"bytes":3204,"hash":"48a1cc684d474bad5a1e9c1097fbc9ec9ed9710f255798981a9f9c9126e2fa94","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"43141448c804292a48a8edd928b3d8a4fc07bbc3ee79db0c91abd0116e2f5dd0","device":"8c9c4986ca881107","findings":[],"hash":"f43f22d092d1dfbc5a587e2b29e7920225c627bc43295eaacde3f4d2335ea5c9","nodeId":"d69c951d-ec56-4b03-874f-1bb120fbcfc3","outcome":"completed","summary":"I found a collision for keccak256 truncated to its first 48 bits:\n\n```json\n{\"algo\":\"keccak256\",\"lambda\":24,\"inputA\":\"imd-9804673\",\"inputB\":\"imd-17368822\"}\n```\n\nBoth inputs are plain text strings. Their digests begin with the same 48 bits, `0x2f72fe059bc2`:\n\n- `imd-9804673` → `2f72fe059bc2493e489ac23cd5bb0119eee739455c6ba49cfd31f75a2b7be703`\n- `imd-17368822` → `2f72fe059bc2f734345293e1223f429e97aea53934f75f186ac1c57ca5f1d550`\n\n**How it was found and checked:**\n- **Search:** a C program (`tools/collide.c`) hashed `imd-0`, `imd-1`, … and stopped when two 48-bit prefixes matched. That took 17,368,823 hashes (about 2^24.05) and roughly 21 seconds on one core, which is in line with the expected cost of about 2^24.\n- **Re-check:** a separately written Python version (`tools/verify.py`) recomputed both digests and confirmed the match.\n- **Known values:** both programs reproduce the published keccak256 hashes of `\"\"` and `\"abc\"`.\n\n**Uncertainty:**\n- I assumed \"keccak256\" means the Ethereum-style function, not the standardised SHA3-256. They produce different digests, and this pair only collides under keccak256. If the verifier actually uses SHA3-256, it will reject this pair.\n- No ready-made hashing library was available, so both checks rely on code I wrote, tied only to those published values.\n\n`artifacts/report.md` has the full report, separating facts, inferences and open questions. I put `collision.json` in the repo root, with a copy in `artifacts/`. All of these are left untracked for upload; `artifacts/` is listed in the repo's local exclude file, so git ignores it. I committed `README.md` and the two programs. Git had no author name or email set, so that commit uses your name and email.","treeHash":"27d111ec3413f7e9727b59524eb3150d6e7b4c11","usage":{"cachedInputTokens":273652,"inputTokens":22,"model":"claude-opus-5-5","outputTokens":9694,"runtime":"claude","turns":12,"wallClockMs":112135}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"f43f22d092d1dfbc5a587e2b29e7920225c627bc43295eaacde3f4d2335ea5c9","verifiedTreeHash":"27d111ec3413f7e9727b59524eb3150d6e7b4c11","verifierVersion":"0.1.0+41305fb5"}]}