architectural solution

A design-level configuration of system components, mechanisms, and their relationships selected and mandated to satisfy a specific security, privacy, or compliance requirement that cannot be reliably met through policy or operational controls alone. In authoritative NIST usage, distinct architectural solutions represent structurally different ways to accomplish the same security objective — for example, whole-database encryption versus client-side field-level encryption — each carrying different key-management and trust implications. In the field, the expression is used when an organization or standard requires that a particular structural approach be prescribed rather than leaving implementers free to choose any mechanism; access enforcement mechanisms, for instance, may be required at both the system level and the application or service level to provide the necessary information security and privacy guarantees. The term operates at the level of system or solution architecture — spanning topology, component selection, and data-flow design — rather than at the level of a single control setting or configuration parameter.

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