In recent years

with the increasing development of Peer-to-Peer technology

secure issues have become more and more prominent for Peer-to-Peer networks.Peer-to-Peer networks have some new characteristics

such as decentralized

dynamic characteristics

and large scales

which makes the traditional internet security technology unsuitable for Peer-to-Peer networks.At present

Peer-to-Peer networks security researches mainly focus on the trust management and authentication.However

there is little research on access control mechanisms for Peer-to-Peer networks.In this paper

a role-based access control model is combined with Peer-to-Peer trust mechanism

and then an access control model based on trust and role for Peer-to-Peer Networks is proposed.Finally

under the Peer-to-Peer file-sharing environments

the Peer-to-Peer access control prototype system is designed and implemented.The experimental results show that the proposed scheme not only can well adapt to the decentralized and dynamic Peer-to-Peer network environments

but also can efficiently protect the safety of the resources and users.