Reusing security solutions: a repository for architectural decision support

Today, the interplay of security design and architecting is still poorly understood and architects lack knowledge about security and architectural security design. Yet, architectural knowledge on security design and its impact on other architectural properties is essential for making right decisions in architecture design. Knowledge is covered within solutions such as architectural patterns, tactics, and tools. Sharing it including the experience other architects gained using these solutions would enable better reuse of security solutions. In this paper, we present a repository for security solutions that supports architectural decisions including quality goal trade-offs. Its metamodel was adapted to special demands of security as a quality goal. The repository supports architecture decisions not only through populating approved solutions but through a recommender system that documents knowledge and experiences of architecture and security experts. We provide a case study to illustrate the repository's features and its application during architecture design.