trustworthy regrading mechanism

A validated, policy-governed process or control that an organization is authorized to deploy when changing the security classification, labels, or other attributes assigned to information — particularly when data crosses between security domains or trust boundaries with differing policies. It is a trusted process authorized to re-classify and re-label data in accordance with a defined policy exception, and its distinguishing characteristic is that the reassignment action itself must be performed only through this controlled channel rather than through ad-hoc or manual means. Validated regrading mechanisms are used by organizations to provide the requisite levels of assurance for attribute reassignment activities. In practice, as seen in both NIST SP 800-53 (control AC-16(9)) and authority documents such as the DoD CMMC Assessment Guide and the Canadian Centre for Cyber Security guidance, enforcement of cross-domain information flow policy includes implementing trustworthy regrading mechanisms to reassign security attributes and security labels alongside hardware-enforced one-way flows and outright transfer prohibitions.