{"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":"3fd50d6a-a79e-4753-a345-d8dfe45612ab","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"a4bc76e3ca0383e0069a252611562ccfddfcdfbdcac85830be45472e62f25f81","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:sha256:24]\nFind a collision for sha256 truncated to the first 48 bits (λ=24).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"<hex 0x... or utf8>\",\"inputB\":\"<hex 0x... or utf8>\"}\nRules:\n- inputA and inputB must be distinct\n- digest(sha256, inputA) and digest(sha256, 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":"86625dc03c637a82308203516e25acf6912160ac4f045e34c15268626b6b5048","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"3fd50d6a-a79e-4753-a345-d8dfe45612ab","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":"51004","feedbackHash":"a1bd468fbf34d4240fd7970a09bf5fdf08f92e6d6b885ae764eb2c85daf45bb0","nodeKey":"research_report","submissionHash":"a4bc76e3ca0383e0069a252611562ccfddfcdfbdcac85830be45472e62f25f81","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"4915c0f188e195b777364220be6e3db70eff38e1d35a5fbdbf1e0d3606701f43","state":"completed","submissions":[{"artifacts":[{"bytes":1904,"hash":"84e6b4f7dd952595725e7628e89061fdfb529d0eb47b70e10c5a523e4ac405f5","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"a595514960523712fcc5d11e595bd28f98b6a4427558497d56a9d95728b0ef8d","device":"560d41abbfbbcbfe","findings":[],"hash":"a4bc76e3ca0383e0069a252611562ccfddfcdfbdcac85830be45472e62f25f81","nodeId":"edd1377d-9fdc-4054-bd4a-55d8fc76b4b3","outcome":"completed","summary":"I found a collision. Two different inputs give SHA-256 digests whose first 48 bits match, and I confirmed it with two separate SHA-256 implementations.\n\n`collision.json`:\n```json\n{\"algo\": \"sha256\", \"lambda\": 24, \"inputA\": \"idmd-7381136\", \"inputB\": \"idmd-18286803\"}\n```\n\n| input (plain text) | SHA-256 |\n|---|---|\n| `idmd-7381136` | **77248f8cf3ce**223b6a1a… |\n| `idmd-18286803` | **77248f8cf3ce**e18b3d10… |\n\n- **Match:** the first 12 hex digits (48 bits) are the same. The 13th digit differs, so the full hashes are different.\n- **How it was found:** `tools/find_collision.py` tried `idmd-0`, `idmd-1`, … and stopped at the first repeated 48-bit prefix. That took 18,286,804 hashes and about 37 seconds. The expected number is about 21 million, so this is normal.\n- **Second check:** I re-ran both hashes with the standard `sha256sum` command (no trailing newline), and the prefixes match there too.\n\nTwo things I couldn't check:\n- **Input format:** I assumed inputs without a `0x` prefix are read as plain text with no newline added, as the task describes. I haven't seen the verifier's code.\n- **The verifier itself:** I didn't run its SIMD implementation, only the two checks above.\n\nDelivered files:\n- **Committed** (commit `7ee005b`): `collision.json`, `tools/find_collision.py` and `README.md`.\n- **Left untracked** as instructed: `artifacts/report.md`, which sets out the evidence, what I concluded from it and what remains open. It's already excluded by `.git/info/exclude`.","treeHash":"894ae7c81e767c1b842fa85b468a20b60ea739c6","usage":{"cachedInputTokens":104819,"inputTokens":10,"model":"claude-opus-5-5","outputTokens":3066,"runtime":"claude","turns":5,"wallClockMs":77124}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"a4bc76e3ca0383e0069a252611562ccfddfcdfbdcac85830be45472e62f25f81","verifiedTreeHash":"894ae7c81e767c1b842fa85b468a20b60ea739c6","verifierVersion":"0.1.0+41305fb5"}]}