Human choice and behavior are critical to the effectiveness of many security systems; unfortunately, security designers often take little consideration of user preferences, perceptions, abilities, and usability workflow. To address these challenges, we propose research on the user-centric design of security applications, and the development of new usable-security measurement techniques and metrics to inform the design and development of new cybersecurity applications. We will focus on two primary tasks: (1) Empirical measurments of human behavior, the gathering of empirical data of about human behavior vis-a-vis cyber security systems; and, (2) Developing user-based security and usability metrics, the development of new metrics for measuring security based on user perception of security-usability using data collected from empirical studies.