{"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":"bd06951d-9f21-42d3-a020-00766d467abd","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"8f476746d19ae603405ba87ac2061b2b5a7df6c8e098d1a04f63b264a5e418b1","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":"bd06951d-9f21-42d3-a020-00766d467abd","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":"50939","feedbackHash":"ca2d76e6f1c337f823645098f023bde15f202ac77c8a58fd5e84a2da95e7ac56","nodeKey":"research_report","submissionHash":"8f476746d19ae603405ba87ac2061b2b5a7df6c8e098d1a04f63b264a5e418b1","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"142efb4cff283312b115416cb9e2d5326f6f6aefc688d907a05b4f24cb0f491a","state":"completed","submissions":[{"artifacts":[{"bytes":2444,"hash":"13cb9ba9d0eb31302d064321a82772eefcd930140c14f48e0506fcc7b4e626ad","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"a939c214b3edf0380cdab1f3a00216d6223684a1b75b72eb195bdbe27575d037","device":"72b617d4b615473a","findings":[],"hash":"8f476746d19ae603405ba87ac2061b2b5a7df6c8e098d1a04f63b264a5e418b1","nodeId":"8bbd6d1d-fe49-4bed-8201-cf644a1095db","outcome":"completed","summary":"I found a real collision on keccak256 truncated to its first 48 bits (λ=24), and checked it with Foundry's `cast keccak`.\n\n```json\n{\"algo\":\"keccak256\",\"lambda\":24,\"inputA\":\"0x00436477\",\"inputB\":\"0x0067ebfa\"}\n```\n\n- `keccak256(0x00436477)` = `0x803f144e84b9` `2d68…018a`\n- `keccak256(0x0067ebfa)` = `0x803f144e84b9` `38cd…54ba`\n\nBoth digests start with the same 6 bytes (`803f144e84b9`) and differ from byte 7 on. So this is a 48-bit collision only, not a full one. The two inputs are different, and I re-ran `cast keccak` on the values read back from the final `collision.json`.\n\n**How I found it:**\n- **Search script:** `tools/find-collision.mjs` is a self-contained Node script, with no dependencies. It hashes 4-byte counters and stops at the first repeated 48-bit prefix.\n- **Checked against `cast`:** before the search, its output matched `cast keccak` on three test inputs.\n- **Run:** the collision came after 6,810,619 hashes (about 2^22.7) in roughly 40 seconds. That is normal luck against the expected cost of about 2^24, so it says nothing about keccak256 being weak.\n\n**Files:**\n- `collision.json` is the answer, with a copy in `artifacts/collision.json`.\n- `artifacts/report.md` is the report. It separates the facts, the inference about cost and the open question.\n- `README.md` describes the question and the limits.\n\nI left the output files untracked and made no commits.\n\n**Open question:** the inputs are written as hex bytes, which I assume the checker decodes as the task's format implies. If it instead hashed the literal text `\"0x00436477\"`, the two inputs would not collide. I couldn't see the checker's code, so this is unconfirmed.","treeHash":"70051b2c64e0d813c61d98979432f12e4acf5cd1","usage":{"cachedInputTokens":212449,"inputTokens":14,"model":"claude-opus-5-5","outputTokens":6672,"runtime":"claude","turns":7,"wallClockMs":107419}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"8f476746d19ae603405ba87ac2061b2b5a7df6c8e098d1a04f63b264a5e418b1","verifiedTreeHash":"70051b2c64e0d813c61d98979432f12e4acf5cd1","verifierVersion":"0.1.0+41305fb5"}]}