Requirements specifications for high assurance secure systems are rare in the open literature. This paper examines the development of a requirements document for a multilevel secure system that must meet stringent assurance and evaluation requirements. The system is designed to be secure, yet combines popular commercial components with specialized high assurance ones. Functional and non-functional requirements pertinent to security are discussed. A multi-dimensional threat model is presented. The threat model accounts for the developmental and operational phases of system evolution and for each phase accounts for both physical and non-physical threats. We describe our team-based method for developing a requirements document and relate that process to techniques in requirements engineering. The system requirements document presented provides a calibration point for future security requirements engineering techniques intended to meet both functional and assurance goals.
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