{"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":"25072068-9eca-4f96-b199-3ebe806c7920","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"83b984f1af2708a5c4f9aaae37f8d4fe336ddadda3079c319d9f8213aa5b0c53","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":"25072068-9eca-4f96-b199-3ebe806c7920","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":"51538","feedbackHash":"55e82a3600d27be39b9dd774d43927819f814527f688dd1f140d28815791c31c","nodeKey":"research_report","submissionHash":"83b984f1af2708a5c4f9aaae37f8d4fe336ddadda3079c319d9f8213aa5b0c53","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"32349c355158f516b5a496ed9c59e06346cd78be5c886a737df4396aab0ec98d","state":"completed","submissions":[{"artifacts":[{"bytes":3316,"hash":"f94bee806551a9abce0f05fe28eecb2da7db17b4965043e448a11e9128ff5b34","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"9839c914e8d638097561b80ffc5a380e5fe18dfd58843fb172f5d8631a1eb2a4","device":"866bf60e68b081d9","findings":[],"hash":"83b984f1af2708a5c4f9aaae37f8d4fe336ddadda3079c319d9f8213aa5b0c53","nodeId":"9ad9bba1-866e-414d-9ba3-96e21667cadc","outcome":"completed","summary":"I found a 48-bit collision for RIPEMD-160 and confirmed it with three separate implementations.\n\n**`collision.json`**\n```json\n{\"algo\":\"ripemd160\",\"lambda\":24,\"inputA\":\"idmd-13458001\",\"inputB\":\"idmd-21777228\"}\n```\n\n| input (UTF-8) | RIPEMD-160 digest |\n|---|---|\n| `idmd-13458001` | **9ff5cb7e7844**b4e20774f357c3ce88d721e7832f |\n| `idmd-21777228` | **9ff5cb7e7844**b94fb8896a518dd50687714b3a45 |\n\n**How it was found:** a birthday search over the strings `idmd-0`, `idmd-1`, … stopped at the first repeated 48-bit prefix after about 21.8M hashes, or about 2^24.4. That matches the expected ~2^24.3, so no shortcut was needed. It took 26 seconds on one core.\n\n**Checks:**\n- **The search code:** before searching, it checks its own RIPEMD-160 against the published `\"abc\"` result.\n- **OpenSSL:** `openssl dgst -rmd160` with the legacy provider gives exactly the digests above.\n- **Pure-Python checker (`tools/verify.py`):** separate code that needs no network. It matches the published test vectors and OpenSSL on a 1000-byte input. It also checks the JSON format and that the inputs differ, then reports a match on the first 48 bits (exit code 0).\n\n**Open question:** I couldn't run the actual SIMD verifier. I assumed \"first 48 bits\" means the first 6 bytes of the digest as normally written in hex. If it truncates differently, for example by word order, this result isn't claimed to hold. The report says this explicitly.\n\n**Files:**\n- **Committed** (`044bdc5` on `main`): `collision.json`, `README.md`, `tools/search.c`, `tools/verify.py`.\n- **Not committed, as required:** `artifacts/report.md`. It holds the evidence, sources, reasoning and open questions. It sits in an ignored folder for the daemon to upload.","treeHash":"2df0db25435b4daa81c460919eb50fba3950b0d1","usage":{"cachedInputTokens":278799,"inputTokens":22,"model":"claude-opus-5-5","outputTokens":10837,"runtime":"claude","turns":14,"wallClockMs":129613}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"83b984f1af2708a5c4f9aaae37f8d4fe336ddadda3079c319d9f8213aa5b0c53","verifiedTreeHash":"2df0db25435b4daa81c460919eb50fba3950b0d1","verifierVersion":"0.1.0+41305fb5"}]}