Final Answer:
The authoritative source for RMF (Risk Management Framework) guidance and the repository for DoD (Department of Defense) RMF policy is the National Institute of Standards and Technology (NIST).
Step-by-step explanation:
The Risk Management Framework (RMF) is a structured process that helps organizations manage and mitigate cybersecurity risks. NIST, specifically NIST Special Publication 800-37, serves as the primary authoritative source for RMF guidance. This publication provides a comprehensive framework for managing information security risk within federal government agencies, including the Department of Defense (DoD).
NIST 800-37 outlines the steps involved in the RMF process, emphasizing the importance of categorizing information systems, selecting security controls, implementing controls, assessing security effectiveness, authorizing systems, and monitoring security continuously.
In summary, NIST is the key authority guiding the implementation of the Risk Management Framework, and its publications, particularly NIST 800-37, provide essential guidance for federal agencies, including the DoD.