Issue link: https://www.e-digitaleditions.com/i/1132978
July/August/September 2019 I 21 For purposes of this discussion, emphasis is placed on one segment of a total security mitigation plan that starts at the outermost boundary or the site perimeter. One of the highest at-risk facilities with the greatest exposure and general accessibility by the public is an airport. The examination of airport physical security (a detailed discussion appears later in this article) offers a high level of complexity while providing a variety of considerations in mitigating physical incursions. However, the principles discussed herein can apply easily to any type and aspect of a facility—from the exterior wall of a building to the most secure interior area. A sound security mitigation plan is rooted in the concept of crime prevention through environmental design (CPTED). The goal of CPTED is to prevent crime by designing and implementing a physical environment that positively influences human behavior by leveraging: • Territoriality • Natural surveillance • Access control • Appearance or perception Working in conjunction with CPTED Security-in-depth is based upon on the application of five fundamental security strategies, also known as the 5D methodology. is the practice of applying security protection in multiple rings or layers, also referred to as security-in-depth. In theory, the first layer is located at the outermost boundary of the site, and additional layers of protection are provided as one moves inward toward the high-value asset or target. It is important that ICT professionals understand the principles of security- in-depth in order to design and deploy the appropriate connectivity, whether utilizing an optical fiber based fence detection system or ensuring that cybersecurity is accompanied by the appropriate physical security for their customers. Security-in-depth is based on the application of five fundamental security DEFEND DELAY DENY DETECT DETER strategies, also known as the 5D methodology (Figure 1): Deter, Detect, Deny, Delay and Defend. The application of the 5D methodology during the design and application of perimeter protection can improve the effectiveness of the facility's security plan by providing defense at the outermost area of the asset or target, while simultaneously enhancing the effective- ness of response personnel. By focusing on these five security objectives at each layer of a perimeter, protection mitigation can be designed in a way that takes the greatest advantage of each security threat. FIGURE 1: The 5D methodology.