A Framework for Estimating the Value of Deterrence.

Area of Science:

• Decision Analysis
• Risk Management
• Security Studies

Background:

• Assessing the effectiveness of security countermeasures is complex, especially against adaptive adversaries.
• Existing benefit-cost analyses often struggle to quantify the value of deterrence.
• Adaptive adversaries pose unique challenges to traditional security models.

Purpose of the Study:

• To develop a framework for calculating the value of deterrence provided by security countermeasures.
• To partition the utility of countermeasures into distinct components: threat reduction, vulnerability reduction, and consequence mitigation.
• To provide a methodology for incorporating deterrence value into benefit-cost analyses.

Main Methods:

• Adaptation of Defender-Attacker Decision Trees.
• Application of decision analysis principles to calculate Expected Utility of Imperfect Control (EUIC).
• Partitioning EUIC into unique contributions from threat reduction, vulnerability reduction, and consequence mitigation, using subtraction logic.

Main Results:

• The framework successfully partitions the utility of countermeasures into three key components.
• The Expected Utility of Imperfect Control (EUIC) quantifies the net benefit of implementing a countermeasure.
• Demonstrated application of the Value of Deterrence framework in an airport security context.

Conclusions:

• The proposed framework offers a robust methodology for explicitly accounting for deterrence in security benefit-cost analyses.
• This approach enables a more comprehensive evaluation of countermeasure effectiveness against adaptive threats.
• Quantifying deterrence value aids in optimizing security investments and resource allocation.