If your security model relies exclusively on the integrity of information processing systems, it's going to fail. Failure is only a function of how much interes

If your security model relies exclusively on the integrity of information processing systems, it's going to fail. Failure is only a function of how much interest there is, and thus investment in, breaking that security. Therefore any decent security model will rely heavily on non-technological methodologies for preserving security compartmentation and protection of vital assets.