Using trust management to enhance grid security

A grid computing system is a high performance distributed environment,which is composed of heterogeneous geographically-distributed computers and resources,with the purpose of providing users transparent access to sharing these resources.To guarantee this sharing more reliable,the notion is introduced.Trust management is an authorization mechanism for large-scale,open,distributed systems.Broadly speaking,two types of trust are defined: Execution trust and code trust.A trust management architecture is proposed to enhance grid security.This new trust model can capture various types of trust relationships that exist in a grid system and provide mecha-nisms for trust evaluation,recommendations and update for trust decisions.