{"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":"c97b53b3-d7ee-49e1-9a8d-f3cabefaf066","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"af2d4cb864bbd1900bcf69b25c51141593af2e669fd62182b4b41cd8ae35f08f","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":"c97b53b3-d7ee-49e1-9a8d-f3cabefaf066","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":"51087","feedbackHash":"c961ba1a0522f3daefe85bd6b30228e868e15b5fb554888e1cd16c5a16102cf3","nodeKey":"research_report","submissionHash":"af2d4cb864bbd1900bcf69b25c51141593af2e669fd62182b4b41cd8ae35f08f","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"1e8d8b6c9da2d51007d5e55ef761ea3c840b9801c328032a8b8192ee5e833b52","state":"completed","submissions":[{"artifacts":[{"bytes":3489,"hash":"4e99297f6c35f0a5a2164d1e44b4b606035f56ad42b29d0f6330b3a3ca9fd579","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"714aba3671fa851d8cda5f06816f9f0dba3669304b566d57dcfd66684e04b49b","device":"87645bda72145989","findings":[],"hash":"af2d4cb864bbd1900bcf69b25c51141593af2e669fd62182b4b41cd8ae35f08f","nodeId":"ebba4bbf-ca7a-4852-8d7d-6178c5467cf0","outcome":"completed","summary":"I'll find a keccak256 collision truncated to 48 bits via birthday search. First, let me inspect the environment.Empty repo, 4GB RAM, gcc available. I'll write a C keccak-256 implementation and run a birthday search (~2^24 evaluations). First, the scratch directory and the C code.Now I'll write the collision search program: a keccak-256 implementation plus a hash table over the truncated 48-bit key.Compile and run the search.Self-test failed — let me cross-check against Python reference implementations to see whether the bug is in the C code or my expectation.No pycryptodome. I'll write an independent pure-Python keccak-256 reference — useful both to debug the C code and to verify the collision later.The Python reference gives the correct `c5d24601...` for empty input, so my C code has a bug. Let me compare the permutation state after one round in both implementations.Now the Python equivalent for comparison.States diverge within the first round. Let me isolate theta vs rho/pi/chi.Found it — theta matches, rho+pi diverges at the last two chain positions. Recomputing the π-cycle rotation offsets by hand gives `..., 61, 20, 44` at the end, not `..., 66, 30` (which would also be a shift > 63, i.e. UB). Fixing the table.Collision found after ~10.8M evaluations. Now let me verify it independently with the pure-Python keccak implementation.Independently verified — both implementations agree on `2c705490d170` for the first 48 bits. Now writing the deliverables.Now copy the tools into the repo as reproducibility evidence and do a final sanity check of `collision.json`.`artifacts/` didn't appear in git status — let me check whether it's ignored or missing.Both output paths are git-excluded as required. Let me commit the tools as evidence and finish.No git identity is configured and I must not modify git config, so the tools stay as untracked files alongside the outputs — that satisfies the delivery rules since the verifier recomputes keccak itself and needs no committed dependencies.\n\nDone. Summary:\n\n- **Collision found** after ~10.77M keccak-256 evaluations (consistent with the ~2^24 birthday bound):\n  - `inputA` = `0x0000000000a445ea`\n  - `inputB` = `0x00000000009f3c16`\n  - Both digests begin with `2c705490d170` (48-bit MSB prefix), diverging at byte 7.\n- **Verification**: two independent implementations agree — a C keccak-256 (birthday search, self-tested against the `keccak256(\"\") = c5d24601...` vector) and a separately written pure-Python keccak-256 (validated against published vectors). During development the empty-string self-test caught a transcription bug in the rho-offset table (`66, 30` → corrected to `20, 44`, recomputed along the pi cycle; `66` would have been a >63-bit rotate).\n- **Deliverables**:\n  - `collision.json` — exact required schema, validated by parsing + recompute.\n  - `artifacts/report.md` — method, evidence, and limits (notes the hex-encoding assumption as the only residual uncertainty).\n  - `tools/find_collision.c`, `tools/keccak_ref.py` — reproducibility evidence; both output paths are git-excluded per the task rules.\n","treeHash":"f33ea39cc31f975103bde4347b177c5aed45587f","usage":{"cachedInputTokens":0,"inputTokens":0,"model":"swe-2-high","outputTokens":0,"runtime":"codex","turns":1,"wallClockMs":433407}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"af2d4cb864bbd1900bcf69b25c51141593af2e669fd62182b4b41cd8ae35f08f","verifiedTreeHash":"f33ea39cc31f975103bde4347b177c5aed45587f","verifierVersion":"0.1.0+41305fb5"}]}