Trust relationships in secure mobile systems

Security on mobile system has attracted so much attention. The traditional method of finding and killing viruses is not suitable for mobile handset due to its limited resources. This paper presented the notion of trust as an important component in a security infrastructure for mobile system and introduced the role of security service provider in the system. A trust model that can be used in tackling the aspect of protecting mobile handset from hostile software is proposed. We defined many trust relationships in our model, and presented a derivation algorithm that can be used to infer new trust relationships from existing ones. A framework of how such a model can be applied in a practical mobile system is provided.