Abstract: By adopting the idea of PKI/CA，a guarantee based cloud computing architecture is proposed in this paper to embolden cloud computing with a credit system，one of the major tasks in the marketing and socializing process of cloud computing nowadays.In this architecture，some special agents are introduced to offer paid guarantee for services in cloud computing，and to compensate invoking users when the services invoked fail.In addition，after a detailed analysis of the bankrupt risks of the guarantee agents，a simulation is conducted to demonstrate the effectiveness of this guarantee based approach.The simulation results show that the accumulative asset-loss for each user changes more gradually；the ability of risk-resistance of each user is strengthened；the total amount of service-invocations increases；and accordingly the total benefits of cloud computing can also be enlarged.

摘要： 针对云计算市场化、社会化发展中面临的信用缺失问题，借鉴互联网中PKI/CA的思想，建立了一种基于担保的云计算框架，通过引入担保方为云服务提供有偿担保，并在云服务QoS不达标或发生安全事故时向用户及时赔偿，从而为云计算引入了一种货币化的信用体系。在此之上，对担保方所面临的破产风险进行了分析，并通过仿真实验验证了引入担保为云计算平台所带来的诸多变化。仿真结果表明，引入担保后，用户的累积损失过程趋向光滑，风险承受能力显著增强，总体的协作发生率明显增加，从而云计算的总体价值可以得到进一步的提升。