关键词: 信任度, 完整性, 模糊集合

Abstract: Integrity measurement is an important technology to meet the requirements of Trusted Computing.According to various kinds of elements which influence the integrity of operating system，a trust degree evaluation model is constructed based on the computing formulas of direct trust degree，indirect trust degree and overall trust degree.With fuzzy set theory，this model quantifies the integrity measurement values between [0，1].Using membership function，the operating system’s trust degree can be divided into four trust levels，but not the false or true judgement method in current integrity measurement model.This method can supply more precise integrity state of computing platform for remote verifier and improve the usability of compute system.The simulation results show that the model gives more objective integrity information of the operating system.

Key words: trust degree, integrity, fuzzy set