{"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":"101930dd-5716-4cf3-ad48-dfbe3ddd6bf4","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"5257f82e7959d7de3dd4203b5117a9580952fd0e309f84287d29197c7fb0d6f2","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":"101930dd-5716-4cf3-ad48-dfbe3ddd6bf4","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":"51510","feedbackHash":"3266c7953d7acea3a5e3f99c129f03bed208af9f3844904da16876a5f82b1b35","nodeKey":"research_report","submissionHash":"5257f82e7959d7de3dd4203b5117a9580952fd0e309f84287d29197c7fb0d6f2","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"90d0834bb1ef995e68542ee18f158a3fc3b85bb323154fad8dc4dad0a9302836","state":"completed","submissions":[{"artifacts":[{"bytes":2221,"hash":"53a669c07d2f9ac44d751e352ab8ee0ad03a78c28ee9164964c8e686f17477a7","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"5c2b364b38ace4bddf72cb5889b819d24a82f1ea139d41e5f79cb50e80b34f42","device":"8d428b115b0ebd64","findings":[],"hash":"5257f82e7959d7de3dd4203b5117a9580952fd0e309f84287d29197c7fb0d6f2","nodeId":"a372f2c8-db20-4a81-a357-5d2f7820886f","outcome":"completed","summary":"I found a collision on SHA-256 cut down to its first 48 bits.\n\n`collision.json`:\n```json\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"imd-12192837\",\"inputB\":\"imd-19093962\"}\n```\n\n| Input (UTF-8 text) | SHA-256 |\n|---|---|\n| `imd-12192837` | **c94563ba4883**4c66186fe07f…074d9 |\n| `imd-19093962` | **c94563ba4883**0d17ce781584…62211 |\n\nThe first 6 bytes (48 bits) match, and the digests differ from bit 49 on.\n\n**How it was found:** a plain birthday search over the strings `imd-0`, `imd-1`, … It hit the first repeated prefix after 19,093,963 hashes (about 2^24.2), which took about 10 seconds. That matches the expected cost of about 2^24. The search always produces the same pair. The script is `tools/find_collision.py`.\n\n**Checks:** Python's `hashlib` and coreutils `sha256sum` give the same digests. A check script confirmed that `collision.json` has exactly the four required keys, that the two inputs differ, and that their 48-bit prefixes are equal. These are my own checks only; no one else has reviewed the result.\n\n**Assumptions in the report:** I'm assuming the verifier hashes each input as UTF-8 bytes because neither starts with `0x`. I'm also assuming \"48 bits MSB\" means the first 6 bytes of the digest. I haven't seen the verifier's own decoding rules. This is a collision on a truncated digest only and says nothing about full SHA-256.\n\n**Delivery:**\n- **Committed (`278f3f1`):** `collision.json`, `tools/find_collision.py` and `README.md`. Git had no author name set, and setting one would mean editing `.git/`, so I set your name and email through environment variables for this one commit only.\n- **Not committed:** `artifacts/report.md` exists and is untracked as required. It's excluded by `.git/info/exclude`, so `git status` won't list it, but the file is there for upload.","treeHash":"7141b66c62bae150e2e9f3595e1fd8d9f7fa314b","usage":{"cachedInputTokens":150211,"inputTokens":14,"model":"claude-opus-5-5","outputTokens":4493,"runtime":"claude","turns":7,"wallClockMs":59952}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"5257f82e7959d7de3dd4203b5117a9580952fd0e309f84287d29197c7fb0d6f2","verifiedTreeHash":"7141b66c62bae150e2e9f3595e1fd8d9f7fa314b","verifierVersion":"0.1.0+41305fb5"}]}