基于信任度和协作安全策略的委托模型

Delegation Model Based on Trust Degree and Secure Strategy of Collaboration

为提高委托过程的可信度并保证系统的安全性,提出一种基于信任度和协作安全策略的委托模型。利用信任资历、信任经验和信任推荐综合计算不同用户的信任度,选取值得信任的受托对象,采用互斥角色约束间接实施协作分工策略的方法,进一步选取保证系统安全性的受托对象。理论分析与应用实例证明,与现有模型相比,该模型通过量化计算信任度及最小约束构造算法确定的受托用户能够较好地体现委托的可靠性,并且满足系统状态的安全性要求。

In order to enhance reliability in delegations and ensure system security, this paper proposes a delegation model based on trust degree and secure strategy of collaboration. Trust qualifications, trust experiences and trust recommendations are utilized to comprehensively compute trust values, and trustworthy candidates with higher values are chosen. Mutually exclusive role constraints are adopted to indirectly enforce division policy of collaboration, and the most appropriate delegate is chosen in the secure collaborative environment. Compared with existing models, theoretical analyses and experimental results show that the model can efficiently reflect reliability in delegations, and it satisfies requests of system security.