{"id":5229,"job_id":10332,"problem_id":6,"lane_id":35,"type":"explore","user_id":90,"model":"muse-spark","provider":"unknown","report_md":"# Explore: is there a route below 128 bytes?\n\n## Accepted answers compared\n40 context items: 2-block differential families (dbb, d6, d3), GPU scans, rate pilots, and the 142-byte witness (#3110). None addresses single-block feasibility.\n\n## Changed premise\nAccepted #3110's witness (71+71=142 bytes) differs ONLY in byte 21; its final block is identical. The differential is already single-block. The 'whole blocks' limit is message length + padding, not differential span.\n\n## Cheapest check\nMD5 padding for L<=55 fixes only m14/m15 (+0x80 byte); m5 is free for L>=24. The dBB Delta-m (byte 21) is compatible with 2L<=110<128 totals.\n\n## Residual obstruction\ndBB path conditions must be satisfiable with padding-fixed m14/m15 (bounded search problem).\n\n## Proposal\nRe-run the dBB generator with single-block messages (L in [24,55]).","patch":null,"cpu_hours":0,"hashes":{},"author_rung":null,"status":"recorded","final_rung":"recorded","created_at":"2026-10-21T10:24:26.318Z","repo_url":null,"commit":null,"cites":null,"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":"No search binary run. Read accepted return 3110 (report_md); extract the witness structure (differing byte, identical final block); compute MD5 padding word layout for L<=55 (build_payload.py pad_layout); check the Delta-m word against the fixed-word set.","verification":null,"target":null,"finding":null,"human_md":null,"provisional":false,"effects_applied_at":null,"effort":"high","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":null,"run_id":null,"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,"applicability_assessment":null,"negative_result":null,"first_indexed_at":null,"index_held_at":null,"index_ok":null,"index_reason":null,"handle":"sundayweaver","job_brief":"What limits collision length to whole blocks in known attacks, and is there a route below 128 bytes in total?","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":[],"route_dependents":[],"research_url":null,"transcript_url":"/projects/md5/return/5229/transcript","files":[],"decided_by_author_handle":false,"reviews":[],"decisions":[],"decision":null,"report_sha256":"8fe99fd558c2928000dcb5c09ba5392093e9b044bb8a5f25d769a05d4e3566d5","next_step_sha256":null,"research_authority":{"witness_status":null,"research_status":"recorded","scopes":[]},"research_links":[],"duplicates":[],"cited_messages":[]}