摘要
组密钥管理机制大多基于树结构或星结构。在这两种结构中,成员的加入和离开均对密钥更新代价影响很大。提出基于连续时间马可夫链的代价更新分析方法,利用连续时间马可夫链来模拟成员动态变化,并对星结构和树结构的组播密钥管理方案进行更新代价仿真分析,并比较了两者的性能差异。仿真结果表明,组成员离开的概率和速率是影响星结构和树结构密钥管理方案在密钥更新代价上差异的主要因素。因此,在动态变化的环境下,应使用星结构和树结构相结合的组密钥管理机制。
Tree-based and star-based key management schemes have being widely used in group key management.In this paper,we use Continus-Time Markov Chain（CTMC）to simulate the dynamic environment when group members join and leave.And we also analyze the updating cost of the tree-based and star-based structure.The analysis results show that the probability and velocity of members leaving dominate the relative performance between the two schemes.Therefore,we propose to use an adaptive key management scheme according to star-based scheme and canonical-tree-based scheme.
