Secure State UML: Modeling and Testing Security Concerns of Software Systems Using UML State Machines

In this research we present a technique by using which, extended UML models can be converted to standard UML models so that existing MBT techniques can be applied directly on these models. Existing Model Based Testing (MBT) Techniques cannot be directly applied to extended UML models due to the difference of modeling notation and new model elements. Verification of these models is also very important. Realizing and testing non functional requirements such as efficiency, portability and security, at model level strengthens the ability of model to turn down risk, cost and probability of system failure in cost effective way. Access control is most widely used technique for implementing security in software systems. Existing approaches for security modeling focus on representation of access control policies such as authentication, role based access control by introducing security oriented model elements through extension in Unified Modelling Language (UML). But doing so hinders the potential and application of MBT techniques to verify these models and test access control policies. In this research we introduce a technique secure State UML to formally design security models with secure UML and then transform it to UML state machine diagrams so that it can be tested, verified by existing MBT techniques. By applying proposed technique on case studies, we found the results that MBT techniques can be applied on resulting state machine diagrams and generated test paths have potential to identify the risks associated with security constraints violation.