This paper examines Physical Security from the perspective of perimeter such as gates/guards, building access controls, room access controls, enforcement options, auditing approaches, risk determination for physical attack vectors, etc. Physical Security describes measures that prevent and/or deter attackers from accessing a facility, resource, or information stored on physical media. It can be as simple as a locked door or as elaborate as multiple layers of armed guard posts.
In the Global world, Physical Security is the most common mechanisms for access control on doors and security containers. They are found in the vast majority of residences, commercial businesses, educational institutions, and government facilities, and often serve as the primary protection against intrusion and theft.