{
  "filing": "#14_cross_layer_hybrid_downgrade_impossibility",
  "honest_scope": "Tier-3 model-relative structural impossibility over an abstract model of the EAP->4-way composition (accepted_group / installed_group / a group-binding bit) under a ML-KEM-stripping attacker; NOT a claim about a deployed stack's code and NOT a legal design-around conclusion. Companion to the ProVerif cross-layer hunt (reports/xlayer_composition_hunt.md). No legal/novelty/FTO/essentiality conclusion.",
  "kind": "REAL",
  "verdict": "real",
  "z3": {
    "all_three_jointly_unsat": true,
    "available": true,
    "claim": "{downgrade-resistant, hybrid-capable, no cross-layer group binding} are jointly impossible under a ML-KEM-stripping attacker; any two are achievable; therefore the cross-layer group binding is FORCED for a downgrade-resistant hybrid-capable EAP->4-way composition (impossibility form of the enterprise cross-layer firewall).",
    "cross_layer_binding_forced": true,
    "ok": true,
    "pair_CS_noB_sat": true,
    "pair_DR_CS_sat": true,
    "pair_DR_noB_sat": true,
    "z3_version": "4.15.4"
  }
}