{"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":"08adfa0c-e0a5-458f-b9de-9401029eb6d7","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"a312288808ca53e5975d59079852df1904356d39913d885dd08972655da31f2e","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:ripemd160:25]\nFind a collision for ripemd160 truncated to the first 50 bits (λ=25).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"ripemd160\",\"lambda\":25,\"inputA\":\"<hex 0x... or utf8>\",\"inputB\":\"<hex 0x... or utf8>\"}\nRules:\n- inputA and inputB must be distinct\n- digest(ripemd160, inputA) and digest(ripemd160, inputB), truncated to 50 bits MSB, must be identical\n- Do not invent a false collision; verification is recomputed by SIMD\nBirthday cost is about 2^25 evaluations.","parentJobId":null,"planHash":"938261736615de72e6375ad8a92e0d8d67741f642f8019bedaa6ff08ef286226","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"08adfa0c-e0a5-458f-b9de-9401029eb6d7","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":"52478","feedbackHash":"4e89fd6ff4f2ef4f921a50ed0e9d74a86f0ad571cbc2f41f2d63549ed4676976","nodeKey":"research_report","submissionHash":"a312288808ca53e5975d59079852df1904356d39913d885dd08972655da31f2e","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"e00facecc0c1239547ddbe107fc18646ccfa8028e8a76a1ad2a94d83f3971c09","state":"completed","submissions":[{"artifacts":[{"bytes":2248,"hash":"f0be9066b97b625d736bead97c27f8750331ef0eed4813baabc15246f25f9901","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"ffa6d025884343bd0e966ffa50d1c9417759f3b4dc9a0730247280bddd46d769","device":"2bdd77125ec75e6c","findings":[],"hash":"a312288808ca53e5975d59079852df1904356d39913d885dd08972655da31f2e","nodeId":"5c1e7f6c-5394-4c69-af80-b7d8b3ba0937","outcome":"completed","summary":"I found a real collision: two different 7-byte inputs whose RIPEMD-160 digests agree on the first 50 bits. I recomputed both hashes with two separate tools and the 50-bit prefixes match.\n\n```json\n{\"algo\":\"ripemd160\",\"lambda\":25,\"inputA\":\"0x006cb558049cd7\",\"inputB\":\"0x02fa4264ec5f6e\"}\n```\n\n| Input | RIPEMD-160 digest |\n|---|---|\n| `0x006cb558049cd7` | `7e0f145324ac784a…` |\n| `0x02fa4264ec5f6e` | `7e0f145324ac434555…` |\n\n- **The match:** the digests share their first 48 bits (`7e0f145324ac`). The next hex digits are `7` and `4`, whose top two bits are both `01`, so the first 50 bits are identical. They differ from bit 51 onward.\n- **The check:** Python's `hashlib` (through `tools/verify_collision.py`, which exits 0) and the `openssl dgst -ripemd160` command both give the same digests.\n- **The search:** a standard birthday-style random walk (`tools/find_collision.py`) took about 78.7 million hash evaluations (about 2^26) and 4 min 50 s on one CPU core. That fits the expected cost of about 2^25 plus overhead. It is a generic search and says nothing about the strength of the full 160-bit RIPEMD-160.\n- **Assumptions:** I couldn't test against the real verifier, so I assumed two things:\n  - It reads a `0x...` value as raw bytes. If it hashed the literal text instead, the collision would not hold.\n  - \"First 50 bits MSB\" means the leading 50 bits of the digest in its normal byte order.\n\n`collision.json`, `README.md` and the two scripts are committed in `c55f187`. Git had no author identity set, so I used your name and email for that commit only. `artifacts/report.md` is written and left untracked for the upload; it covers the evidence, method and assumptions, with facts kept separate from inferences.","treeHash":"215f28966b6ef99fe33e4f310f63437634f6b744","usage":{"cachedInputTokens":237048,"inputTokens":20,"model":"claude-opus-5-5","outputTokens":5567,"runtime":"claude","turns":10,"wallClockMs":351451}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"a312288808ca53e5975d59079852df1904356d39913d885dd08972655da31f2e","verifiedTreeHash":"215f28966b6ef99fe33e4f310f63437634f6b744","verifierVersion":"0.1.0+ad90ce4c"}]}