Editorial

Various research papers aimed at addressing the challenges of designing and implementing business processes by means of Web services orchestration through security and dependability models and languages are presented. The research paper entitled Model-driven business process security requirement specification shows ways to express specific types of security goals in a graphical fashion at the business process modeling level. Security architecture for virtual organizations of business Web services aims at managing access control policies in virtual organizations, supporting and securing all web service interactions. Landscape-aware location-privacy protection in location based services introduces spatial obfuscation techniques, actuated by a trusted agent. The paper entitled Enforcing role based access control model with multimedia signatures extends role-based access control paradigm to the management of multimedia objects in a dynamic environment.