From the viewpoints of dependable computing and ubiquitous computing, a new type of reactive systems, named
Persistently Reactive Systems
, was proposed. Persistently reactive systems cause some new security issues because of their continuous and persistent running without stopping their services. Based on the recognition that a persistently reactive systems can be constructed following the methodology of soft system buses, this paper defines security issues in persistently reactive systems with security requirements and security functions. To solve the issues, we propose a framework of SSB-connector, such that designers and developers can easily design and develop reliable and secure functional components of a persistently reactive system.