Secure software architecture is increasingly important in a data-driven world. When security is neglected sensitive information might leak through unauthorized access. To mitigate this software architects needs tools and methods to quantify security risks in complex systems. This paper presents doctoral research in its early stages concerned with creating constructive methods for building secure component-based systems from a quantitative information flow specification. This research aim at developing a method that allows software architects to develop secure systems from a repository of secure components. Planned contributions are refinement rules for secure development of components from a specification and well-formedness rules for secure composition of said components.