一种新的基于LKH的组播密钥更新方案

A New Rekeying Scheme for Multicast Based on LKH Tree

安全组播是组播技术走向实用化必须解决的问题。在组成员动态变化时,设计一个高效的密钥管理方案是安全组播研究的主要问题。本文提出了一种基于LKH模型的组播密钥更新方案。该方案基于分层机制将一个组播分为几个小组,并且采用指数函数和随机密钥,使得在组成员离开组播时,具体的密钥更新由组成员自己完成。本方案比传统方案减少了密钥更新开销量,提高了密钥更新效率,并缩减了密钥存储量。

Secure muhicast is a key issue to be solved that multicast technology can be widely deployed. When group members join or leave dynamically, the main research for secure muhicast is how to design an efficient key management scheme. This paper proposes a rekeying scheme for muhicast based on LKH tree. This protocol is based on a hierarchy approach in which the group is logically divided into subgroups, the exponential function and the random keys are also used to update the group key when a member leaves. Comparing with the traditional hierarchical key-tree, theory analysis shows that the solution efficiently decreases the communication cost of rekeying and the storage of group controller.