{"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":"3c724444-e446-452b-be3d-771bdc981cdf","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"11a3fe00635f198e054fcaf3f631612f9a6f957c903eafe4067fdb74ab77f5d8","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":"3c724444-e446-452b-be3d-771bdc981cdf","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":"51134","feedbackHash":"97e0e28dfbf743bc27c5aae09af40aec383ca8679ae060cf41f90e64baca303a","nodeKey":"research_report","submissionHash":"11a3fe00635f198e054fcaf3f631612f9a6f957c903eafe4067fdb74ab77f5d8","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"7a7ebbee4139baf7011915df81e77e9b556b3eac8662cbc1f786d09f44f79879","state":"completed","submissions":[{"artifacts":[{"bytes":11125,"hash":"86a560f03556e6212aee9c768d6a1d16c0a2d971df15ea7e9e8cbfa8d0a9b8d1","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"3e8fcbd609386a835ed5bd4c158bad5a9a753d54292b4351a67e5a4a5fbefb7c","device":"79953a27daf74ea7","findings":[],"hash":"11a3fe00635f198e054fcaf3f631612f9a6f957c903eafe4067fdb74ab77f5d8","nodeId":"3270f64b-389e-489f-8126-3d21eecceedb","outcome":"completed","summary":"Done. Collision found, verified four ways, and delivered.\n\n**Result** (`collision.json`, 93 bytes, untracked):\n```json\n{\"algo\":\"keccak256\",\"lambda\":24,\"inputA\":\"0x8375360100000000\",\"inputB\":\"0x7131040200000000\"}\n```\n```\nkeccak256(0x8375360100000000) = 8851a59bbb9d 6231d46ab9566296d3aed4afb5cd4212a1f68a094142b0366868\nkeccak256(0x7131040200000000) = 8851a59bbb9d 27a12c8340ba34a0ac8820e6315e00542945f74d66f4ef53a9b1\n```\nDistinct 8-byte messages, identical first 48 bits (`8851a59bbb9d`), first difference at digest byte 6.\n\n**What's in the repo** (committed at `bec4a21`): `src/keccak.h` (Keccak-f[1600] + keccak256 with original-Keccak `0x01` padding), `src/collide.c` (deterministic birthday search, counters from 1, 2^26-slot counter-only table = 256 MiB; every table hit is confirmed by recomputing the digest, so index aliasing can't fabricate a collision), `tools/verify_collision.py` (dependency-free verifier with its own independently written pure-Python keccak), `Makefile`, `README.md`.\n\n**Checks I ran**\n- `make selftest`: four published keccak256 vectors match, including the empty-string EOA codehash `c5d24601…`; fast 8-byte path agrees with the generic path for 1000 inputs.\n- `make verify`: pure-Python verifier recomputes both digests from the JSON and passes; `pycryptodome` 3.23 cross-check agrees; `pysha3` (Keccak Code Package binding) also agrees on all 256 bits of both digests — four implementations total.\n- Negative tests: the verifier rejects identical inputs, a non-colliding pair, wrong `algo`, and an extra JSON key (so the \"VERIFIED\" line isn't vacuous).\n- Determinism: a second full run produced a byte-identical `collision.json`.\n- Cost: 33,829,233 evaluations in 15.1 s single-threaded, ≈1.6× the birthday mean of ~2.1·10⁷ — an ordinary draw.\n\n**Main residual risk** (documented in §4 of the report, not fixable cheaply): if the grading verifier recomputes with FIPS 202 SHA3-256 while calling it `keccak256`, this pair fails — under SHA3-256 the inputs hash to `be9557c3…`/`45a1116d…` with no shared prefix. The task's naming and Ethereum convention both point to the Keccak variant, so I went with that; a SHA3-256 pair is a one-byte change (`0x01`→`0x06`) and another 15 s if ever needed. λ=24 is read as 48 bits per the task text, and a 48-bit match implies a 24-bit match either way.\n\nReport is at `artifacts/report.md` — facts (with the commands and outputs behind each), inferences, uncertainty, open questions, method, and sources separated; both named outputs left untracked via `.gitignore`.","treeHash":"d2260cd4a852308ddc3a420564b7c9ca4d0eae7a","usage":{"cachedInputTokens":997182,"inputTokens":50,"model":"claude-opus-5","outputTokens":28938,"runtime":"claude","turns":25,"wallClockMs":440065}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"11a3fe00635f198e054fcaf3f631612f9a6f957c903eafe4067fdb74ab77f5d8","verifiedTreeHash":"d2260cd4a852308ddc3a420564b7c9ca4d0eae7a","verifierVersion":"0.1.0+41305fb5"}]}