{"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":"9dfb975b-1ffd-4246-8c4e-28c29b6869ed","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"5451f48362703116587e4d44f994997e1ecbeb143d03b9d22e2865535a4ea887","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":"9dfb975b-1ffd-4246-8c4e-28c29b6869ed","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":"50974","feedbackHash":"a9937422455f66676830198032ac01cb74bce98cec2bd4048d309d61f3614a20","nodeKey":"research_report","submissionHash":"5451f48362703116587e4d44f994997e1ecbeb143d03b9d22e2865535a4ea887","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"a02337a6defb81654a1eea2603e2c0497d61157947ceb8e36c6bc6a824962325","state":"completed","submissions":[{"artifacts":[{"bytes":2991,"hash":"00ebab39a5f5766938e0b75b180049c7fe3c69a3a98c3edc4f13c0cd4783e595","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"9df4b540bd078a6cc40d5de51f4194908130e1c3f10fda8812828291265f0a87","device":"98b4506bef931d13","findings":[],"hash":"5451f48362703116587e4d44f994997e1ecbeb143d03b9d22e2865535a4ea887","nodeId":"108e275c-fd9a-462f-86bc-804994a2a6b9","outcome":"completed","summary":"I found a real collision and checked it two separate ways.\n\n```json\n{\"algo\": \"sha256\", \"lambda\": 24, \"inputA\": \"simd-sha256-48-15157794\", \"inputB\": \"simd-sha256-48-29860063\"}\n```\n\nThe inputs are plain UTF-8 text (they don't start with `0x`). Their SHA-256 digests:\n\n- `5902bd0bf52c`f215d5ba52f374cc0f373bfbba22268324412c4782b72e2324c1\n- `5902bd0bf52c`155257dd9503cb9ffd80a0ae92d23ae8479e8ab985e224e48ef0\n\nThe first 48 bits (`5902bd0bf52c`) are the same in both, and the bits after that differ. The search script checks the match with Python's `hashlib`, and I checked it again with `sha256sum`. Anyone can repeat the check with `printf '%s' <input> | sha256sum`.\n\n**How it was found:** a birthday search over the strings `simd-sha256-48-<i>`, implemented in `scripts/find_collision.py`. It found the match after 29.86M hashes (about 2^24.8) in roughly 59 seconds. The average expected for 48 bits is about 21M, so this run was normal. Rerunning the script finds the same pair.\n\n**Files:**\n- `collision.json` (repo root), `README.md` and `scripts/find_collision.py` are committed. Git had no author name configured, so the commit uses your name and email for authorship.\n- `artifacts/report.md` and a copy at `artifacts/collision.json` are left untracked for the daemon to upload. The report keeps the evidence and sources separate from assumptions and open questions.\n\n**Uncertain:** I couldn't see the SIMD verifier's code, so I'm assuming it hashes the raw UTF-8 bytes with no trailing newline and compares the first 6 bytes of the digest. If it only accepts hex, the hex forms of both inputs are in the report and give the same digests.","treeHash":"6be3a3979af290abd20f27bc3455721c7bd31b51","usage":{"cachedInputTokens":133831,"inputTokens":12,"model":"claude-opus-5-5","outputTokens":4725,"runtime":"claude","turns":6,"wallClockMs":107445}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"5451f48362703116587e4d44f994997e1ecbeb143d03b9d22e2865535a4ea887","verifiedTreeHash":"6be3a3979af290abd20f27bc3455721c7bd31b51","verifierVersion":"0.1.0+41305fb5"}]}