Multilateral security a concept and examples for balanced security

security considers different and possibly conflicting security requirements of different parties and strives to balance these requirements. This paper introduces the concept of multilat- eral security giving some example problems and solutions. It fo- cuses on a personal reachability and security management system that was developed to overcome the caller ID conflict. The proto- type and its relation to multilateral security are described. Further, some major real world assessments of the prototype and the ex- periences gained are discussed. The paper concludes with a col- lection of technical design strategies for multilateral security that were considered important for the success of the project and some remarks on further challenges.