Human-centered specification exemplars for critical infrastructure environments.

Specification models of critical infrastructure focus on parts of a larger environment. However, to consider the security of critical infrastructure systems, we need approaches for modelling the sum of these parts; these include people and activities, as well as technology. This paper presents human-centered specification exemplars that capture the nuances associated with interactions between people, technology, and critical infrastructure environments. We describe requirements each exemplar needs to satisfy, and present preliminary results in developing and evaluating them

Finding and Resolving Security Misusability with Misusability Cases

Although widely used for both security and usability concerns, scenarios used in security design may not necessarily inform the design of usability, and vice- versa. One way of using scenarios to bridge security and usability involves explicitly describing how design deci- sions can lead to users inadvertently exploiting vulnera- bilities to carry out their production tasks. This paper describes how misusability cases, scenarios that describe how design decisions may lead to usability problems sub- sequently leading to system misuse, address this problem. We describe the related work upon which misusability cases are based before presenting the approach, and illus- trating its application using a case study example. Finally, we describe some findings from this approach that further inform the design of usable and secure systems

Usability and security by design: a case study in research and development

There is ongoing interest in utilising user experiences associated with security and privacy to better inform system design and development. However, there are few studies demonstrating how, together, security and usability design techniques can help in the design of secure systems; such studies provide practical examples and lessons learned that practitioners and researchers can use to inform best practice, and underpin future research. This paper describes a three-year study where security and usability techniques were used in a research and development project to develop webinos — a secure, crossplatform software environment for web applications. Because they value innovation over both security and usability, research and development projects are a particularly difficult context of study. We describe the difficulties faced in applying these security and usability techniques, the approaches taken to overcome them, and lessons that can be learned by others trying to build usability and security into software systems.</p