基于多代理系统的动态信任态势感知机制

摘要

网络环境的开放和动态特性使得多代理系统的安全问题越发严峻,一种可行的最小化威胁的方案是通过实时评估交互代理的信任,以信任作为系统安全的主要参考要素,协助代理选取服务提供者来实现对恶意代理的限制.该机制以时间为维度动态计算信任,经过信任真实性与逻辑性检测后对代理信任进行判别决策,辅助信任管理.仿真对比验证DynamicTrust敏感度和信任计算规则合理,符合信任机制的"慢升快降"原则,且拥有负载均衡机制,能有效识别和控制代理攻击行为.%The open and dynamic nature of the network environment makes it a challenge for the multiagent system to work in a secure environment.One feasible way to minimize the threats is to evaluate the trust of interactive entities and use trust as the main reference element of system security to assist agents in selecting the service provider in order to control the malicious agents.The mechanism is in the dimension of time to calculate trust.After the trust authenticity test and the logicality test,the system makes judgment and decision of agents' trust to assist trust management.Simulation analysis shows that DynamicTrust has a reasonable rule in computing sensitivity and trust.Incorporating the principle of "slow rise and quick decline" and with the load-balancing mechanism,DynamicTrust can effectively identify and control attacks.