由于云计算的动态性和开放性,云环境中频频出现恶意攻击行为,为了保障云计算的安全,结合可信云的思想,提出一个云计算下基于信任的防御系统模型.该模型通过实时监控获取用户的行为证据并加以规范;提出一种新的基于模糊层次分析法(FAHP)的用户行为信任评估方法,逐步确定各行为证据的权重,实现行为信任的科学量化评估;利用多种检测引擎对可疑文件进行全面检测和综合决策,为云中用户提供最大限度的安全防御.实验结果表明,该系统模型能有效消除不良用户的恶意攻击行为、降低病毒等给用户带来的损失,达到云端和客户端双向防御的目的.%Because of the cloud computing's characteristics of being dynamic and open, continuous malicious attacks happen frequently. With the idea of trusted cloud, a defense system model based on trust for cloud computing was constructed to guarantee the cloud security. Through real-time monitoring, users' behavior evidences could be obtained and standardized;a new method for users' trust evaluation based on fuzzy Analytic Hierarchy Process (AHP) was presented, which gradually determined the weights of behavior evidences, achieved quantitative assessment of behavioral trust; so as to provide great security defense for users. Besides, multiple detection engines were used to conduct a comprehensive inspection of suspicious files and to make integrated decisions. The experimental results show the system model can effectively eliminate the malicious behaviors from undesirable users, reduce users' damages caused by virus and achieve a two-way defense for both cloud and client.
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