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A significant limitation of current cyber security research and techniques isits reactive and applied nature. This leads to a continuous 'cyber cycle' ofattackers scanning networks, developing exploits and attacking systems, withdefenders detecting attacks, analyzing exploits and patching systems. Thisreactive nature leaves sensitive systems highly vulnerable to attack due toun-patched systems and undetected exploits. Some current research attempts toaddress this major limitation by introducing systems that implement movingtarget defense. However, these ideas are typically based on the intuition thata moving target defense will make it much harder for attackers to find and scanvulnerable systems, and not on theoretical mathematical foundations. Thecontinuing lack of fundamental science and principles for developing moresecure systems has drawn increased interest into establishing a 'science ofcyber security'. This paper introduces the concept of using cybernetics, aninterdisciplinary approach of control theory, systems theory, informationtheory and game theory applied to regulatory systems, as a foundationalapproach for developing cyber security principles. It explores potentialapplications of cybernetics to cyber security from a defensive perspective,while suggesting the potential use for offensive applications. Additionally,this paper introduces the fundamental principles for building non-stationarysystems, which is a more general solution than moving target defenses. Lastly,the paper discusses related works concerning the limitations of moving targetdefense and one implementation based on non-stationary principles.

Application of Cybernetics and Control Theory for a New Paradigm in Cybersecurity