Felkner, A
Trust plays an important environments. That is why it has been the focus of researchers for a long time. It allows us to delegate tasks and decisions to an appropriate person. In social sciences trust between humans was studied but it also was analysed in economic transactions. A lot of computer scientist from different areas, like security, semantic web, electronic commerce, social networks tried to transfer this concept to their domains. Trust is an essential factor in any kind of network, whether social or computer. Wireless sensor networks (WSN) are characterised by severely constrained resources, they limited power supplies, low transmission bandwidth, small memory sizes and limited energy, therefore security techniques used in traditional wired networks cannot be adopted directly. Some effort has been expended in this fields, but the concept of trust is defined in slightly different ways by different researches. In this paper we will show how the family of Role-based Trust management languages (RT) can be used in WSN. RT is used for representing security policies and credentials in decentralised, distributed access control systems. A credential provides information about the privileges of users and the security policies by one or more trusted authorities.