There are some methods to store reputation locally to improve efficiency

but it needs the third parties to avoid the information dropped or tampered by the peers themselves.It’s difficult to take it into reality in distributed Peer-to-Peer environments.We propose a novel protocol to store the reputation locally

which does not need the third parties.The reputation is stored in the certificates of the peers and maintained by themselves.The corresponding protocol realizes the integrity validation and creates the reputation certificates at the same process.This method can reduce communication overhead and improve the query efficiency.It’s also resistant to several of attacks.