{"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":"a0535ae6-a477-4cdf-9385-2783a5df4a5d","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"61a64f0e4babcb07861105bd2794d9172b5f56183b1eec4e877f29ff2c0c4fd6","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:ripemd160:24]\nFind a collision for ripemd160 truncated to the first 48 bits (λ=24).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"ripemd160\",\"lambda\":24,\"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 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":"db8cf59269792af61e6af2b5ee3f86a9745dd031d74535fb14290fe873f6a5ff","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"a0535ae6-a477-4cdf-9385-2783a5df4a5d","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":"51352","feedbackHash":"463a3a5ac3f03b8bd17fe01e394584c93173683f8bf375ff0f5bb628bb49650e","nodeKey":"research_report","submissionHash":"61a64f0e4babcb07861105bd2794d9172b5f56183b1eec4e877f29ff2c0c4fd6","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"fe47336561931a3a1d5705955824a29ece9259e502ce185ffe20a55a609c3eb4","state":"completed","submissions":[{"artifacts":[{"bytes":2620,"hash":"9737779e5828b670ce85ffad3199addda8472657dd67fafd3a247f3048296021","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"43bcf9ff71767d68172a3baee2f7a04e28ed76018abd72bd0f47ec994fb2e2fc","device":"8f08088e7a7f557f","findings":[],"hash":"61a64f0e4babcb07861105bd2794d9172b5f56183b1eec4e877f29ff2c0c4fd6","nodeId":"f82b8951-5fa5-49d5-830c-10949d04a871","outcome":"completed","summary":"I found a collision. The two inputs are different, and the first 48 bits of their RIPEMD-160 digests are the same. I checked it locally with three separate implementations (Node, Python and OpenSSL), but I couldn't run the verifier's own one.\n\n`collision.json`:\n```json\n{\"algo\":\"ripemd160\",\"lambda\":24,\"inputA\":\"rmd48-12932577\",\"inputB\":\"rmd48-13878042\"}\n```\n\n| Input | Full RIPEMD-160 digest | First 48 bits |\n|---|---|---|\n| `rmd48-12932577` | `f38b48a5fbb5fa7dfd4be58b45df9cb55f1c37df` | `f38b48a5fbb5` |\n| `rmd48-13878042` | `f38b48a5fbb5350b30a46c5e462087d3b120d27a` | `f38b48a5fbb5` |\n\n- **How it was found:** a plain birthday search (hash numbered strings and wait for a repeated 48-bit prefix) hit a match after 13,878,043 hashes, about 2^23.7. That is in line with the expected ~2^24.3 and took about 39 seconds. No weakness in RIPEMD-160 was used.\n- **Checks:** Node, Python and OpenSSL all give the same digests. Node and Python also give the published test-vector result for `\"abc\"`.\n- **Main risk:** the inputs are plain text strings, not `0x` hex. If the verifier reads them any other way, the result won't hold.\n- **Not committed:** git has no author name or email set up here, and I'm not allowed to change `.git/`. `README.md` and `scripts/find_collision.mjs` are staged but not committed. As required, `collision.json` and `artifacts/report.md` are left untracked.\n\nFiles:\n- `collision.json`\n- `artifacts/report.md`: separates facts, inferences and open questions\n- `README.md`\n- `scripts/find_collision.mjs`: reruns the search","treeHash":"6fbf6a4d0e36ffff76dc2cdbb2b9b37ec9570d9d","usage":{"cachedInputTokens":148690,"inputTokens":12,"model":"claude-opus-5-5","outputTokens":4378,"runtime":"claude","turns":8,"wallClockMs":98127}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"61a64f0e4babcb07861105bd2794d9172b5f56183b1eec4e877f29ff2c0c4fd6","verifiedTreeHash":"6fbf6a4d0e36ffff76dc2cdbb2b9b37ec9570d9d","verifierVersion":"0.1.0+41305fb5"}]}