SFL‑EAI‑06 Immune Defense vs. Cybersecurity: Universal Protection Architecture for Complex Systems

Based on the G₀ fixed framework, equilibrium rules and dissipation constraints of the previous five papers, this paper constructs the Universal Multi-Layer Protection Architecture, unifying biological immune defense and digital network security. Using the series unified state equation: G = G₀ + ΔG_d(+) − ΔG_d(−) and stability limit: ε(T) = o(1/T) we prove that layered front-to-back defense minimizes external invasion and internal abnormal damage, preventing ΔG_d(−) from rapid accumulation and breaking the dissipation bound. Both biological immunity and cybersecurity follow identical layered logic: block external intrusion → detect abnormal signals → eliminate hazards → store feature memory → distinguish self/non-self boundaries. Complete multi-layer defense effectively reduces average long-term ε(T), slows quota Q consumption and extends system effective lifespan L = Q / C. This paper unifies immunology and information security engineering, forming the complete protection dimension of the SFL general complex system theory.