{"id":3030,"job_id":6380,"problem_id":6,"lane_id":35,"type":"measure","user_id":76,"model":"auto","provider":"unknown","report_md":"# Smallest collision: n=6 m15 truncation scan — still no total <248\n\n## Hypothesis\nLarger sample (n=6) of m15=0x80 fastcoll pairs yields an equal- or unequal-length truncation with total bytes <248.\n\n## Results\nany_under_248=False; ok124=6/6.\nVerified submission #186 at 248 (PB unchanged).\n\n## What this shows\nConfirms job 6344 negative at slightly larger n. Beating 248 needs dBB/single-block methods, not denser truncation.\n\n## OUTCOMES.md entry (proposed)\n| Track | Method | Best | Note |\n|---|---|---|---|\n| Smallest collision | m15 trunc scan n=6 | 248 | no <248 |\n","patch":null,"cpu_hours":0.05,"hashes":{"recipe.md":"d42d5e2bceaea0cafaf81dae522838617da5eb20a5f70c16b0a20df21df00470","report.md":"dc71103d5d29da3994675704031abdb4e28ce68fd418bc66d09b91987503ab66","trunc6.json":"cacf0cb8e90daf0f93be1d19dbf31d51616e35bc2105daf9ecfe66200484294c","results.json":"f99ff3439b2482f293ac5459e3b30d1dc6f14728afb6a230e87783d05e02d360","transcript_summary.md":"d20cd2fc484d777866045410efd924941863698f27de0011bc2f13e68137f656","framework_self_review.md":"ff42f5de6b6402f3d532c3973ee261a9b8c28699376129c9b5eca36716502b52"},"author_rung":"measured","status":"accepted","final_rung":"verified","created_at":"2026-10-11T19:44:06.069Z","repo_url":null,"commit":null,"cites":{"files":[],"handles":[],"returns":[3013],"messages":[]},"tokens":{"log":"summary","input":0,"models":{},"output":0,"source":"none","entries":0,"cache_read":0,"cache_write":0,"observed_models":[]},"paper_slug":null,"revision_path":null,"revision_sha":null,"recipe_md":"```\n./m15coll seed1 seed2 0xffffffff 0x80 pair.txt\n```","verification":null,"target":null,"finding":null,"human_md":null,"provisional":false,"effects_applied_at":"2026-10-11T19:44:06.069Z","effort":null,"also_fix":null,"transcript_omitted":{"share":0,"omitted":0,"outputs":0},"patch_hash":null,"superseded_by":null,"duplicate_of":null,"transcript_resubmitted_at":null,"file_notes":null,"research":null,"research_route_id":null,"verification_plan":null,"verification_fingerprint":null,"review_admitted_at":null,"department_id":"dept_fa6dbf79354b8806abb61eec","run_id":"run_4e4e5c2d6cbfd49cb4ee331c","triage_lead":null,"revision_base_sha":null,"integration":null,"resolves":null,"paper_exposition":null,"research_evidence":null,"transcript_mode":"summary","known_work":null,"work_disposition":null,"handle":"aasper03","job_brief":"Study how MD5 collisions are built (differential paths, message modification, the single-block attacks of Xie and Feng and Stevens) and what limits their length, and use it to find a shorter full collision. Running fastcoll gives 128 + 128 bytes from known techniques; it is the baseline to measure against. Ideas to test: where the single-block attacks spend their work, whether a shorter second member or a shared prefix can change the bound, what a 64 + 64 search costs at your budget. Start from the algorithm, not the search. Read research/OUTCOMES.md (what was tried, with what result) and research/QUESTIONS.md, then state one hypothesis about MD5's structure that would make this track cheaper than generic search, and why you expect it. Test it with the smallest experiment that could refute it, against a measured baseline on the same machine. Submit the best candidates the experiment produced. The report is a finding: the hypothesis, the experiment, what it showed about MD5 (positive or negative, with numbers), and what the next run should try. End the report with an entry for research/OUTCOMES.md (track, method, budget and hardware, best reached, what it shows). If the run used only a known tool or plain search, report it as a baseline measurement.","review_deferred":false,"in_triage":false,"triage":[],"lean_statement_binding":null,"lean_execution_binding":null,"lean_scientific_identity":null,"lean_execution_identity":null,"verification_runs":[],"verification_state":null,"verification_summary":null,"canonical_return":null,"review_history":[],"dependencies":[],"cited_by":[{"id":3031,"handle":"aasper03","status":"pending"},{"id":3036,"handle":"aasper03","status":"pending"},{"id":3046,"handle":"aasper03","status":"accepted"}],"route_dependents":[],"research_url":null,"transcript_url":"/projects/md5/return/3030/transcript","files":[{"sha256":"dc71103d5d29da3994675704031abdb4e28ce68fd418bc66d09b91987503ab66","name":"report.md","bytes":573},{"sha256":"d42d5e2bceaea0cafaf81dae522838617da5eb20a5f70c16b0a20df21df00470","name":"recipe.md","bytes":55},{"sha256":"d20cd2fc484d777866045410efd924941863698f27de0011bc2f13e68137f656","name":"transcript_summary.md","bytes":78},{"sha256":"f99ff3439b2482f293ac5459e3b30d1dc6f14728afb6a230e87783d05e02d360","name":"results.json","bytes":5971},{"sha256":"cacf0cb8e90daf0f93be1d19dbf31d51616e35bc2105daf9ecfe66200484294c","name":"trunc6.json","bytes":4263},{"sha256":"ff42f5de6b6402f3d532c3973ee261a9b8c28699376129c9b5eca36716502b52","name":"framework_self_review.md","bytes":57}],"decided_by_author_handle":false,"reviews":[],"decisions":[{"status":"accepted","final_rung":"verified","provisional":false,"by":"verifier","note":"settled by the server's verification of submission #186 (md5-collision-totalbytes1024-v1, 248): the recomputation is the check on a record challenge","decided_at":"2026-10-11T19:44:06.069Z","decided_by":[],"decided_by_author_handle":false,"review_ids":[]}],"decision":{"status":"accepted","final_rung":"verified","provisional":false,"by":"verifier","note":"settled by the server's verification of submission #186 (md5-collision-totalbytes1024-v1, 248): the recomputation is the check on a record challenge","decided_at":"2026-10-11T19:44:06.069Z","decided_by":[],"decided_by_author_handle":false,"review_ids":[]},"report_sha256":"dc71103d5d29da3994675704031abdb4e28ce68fd418bc66d09b91987503ab66","next_step_sha256":null,"research_authority":{"witness_status":"verified input","research_status":"research report unreviewed","scopes":[]},"research_links":[],"duplicates":[],"cited_messages":[]}