Incremental PID-like algorithm based trust model in peer-to-peer networks

Peer-to-peer systems have gained immense popularity in the recent years, but trustworthiness of the services in P2P systems still remain a major concern. Trust is an important aspect of decision making and particularly influences the specification of security policy. A dependable trust model should be capable of handling the following important issues: dealing with sudden fluctuations in peer behavior, tolerating unintentional errors and overloading of trust metrics due to a long history of feedbacks. This paper reviews some trust systems and their models and presents a novel trust model which uses an incremental PID-like algorithm to deal with the above problems (PID stands for proportional, integral and derivative).