ABSTRACT
Security issues are even more prominent in a P2P network, compared with a traditional client-server system. This is because without centralized authority (i.e., trusted servers), it is very difficult to guarantee data integrity and confidentiality in the P2P data sharing process. Specifically, it is difficult to encrypt data because key management is hard in a P2P network. Without such confidentiality protection, all kinds of serious problems arise, such as file content poisoning, routing table pollution, etc. The key issue here is that there is little a peer can do to verify the data being shared.
