As an emerging non-traditional security threat, cognitive warfare undermines social systems by manipulating information dissemination, distorting cognitive consensus, and eroding social trust. The reliability of social systems against cognitive warfare reflects their ability to maintain core functions, resist cognitive infiltration, and restore social order. To quantitatively evaluate this reliability, this paper proposes a hybrid approach integrating the Extended Fault Tree (EFT) and Multi-Valued Decision Diagram (MDD). First, key failure paths and interdependencies are identified, including cascading failures among four core subsystems: information dissemination, cognitive consensus, socia... More >