可靠可缩放安全多播密钥更新实现研究

实现安全多播的一般方法是设法让参与多播的所有成员共享一个组密钥，当有组成员离开或组密钥失密时，要进行组密钥的更新，当多播组较大时，组密钥更新的缩放性和可靠性是一个重要问题，解决缩放性可采用批量密钥更新方法(BKR)；解决可靠性可基于报文重传和纠错码等方法，WKA给出了一种对密钥树分层加权解决上述问题，在分析密钥更新需求的基础上，基于WKA方法，提出了一种在前缀编码的密钥树中，实现动态分层式密钥更新的方法(A-WKA)，使用前缀编码可以很方便地计算出密钥树中变化结点位置关系，从而为动态分层提供快速、准确的决策依据，仿真分析表明，所提出的算法较WKA方法有较大的优势。

Research on Implementation of Scalable and Reliable Secure Multicast Rekeying

Secure multicast plays an important role in multicast applications Generally, the implementation of secure multicast is to try to let all the members in a multicast group to share a common secret key When any members leave the group or the key is compromised, the group key should be changed, which is called the group rekey It is a very important issue that the group rekey should be scalable and reliable The method of batch key retransmission (BKR) is used to solve the scalable issues, and the packet retransmission or forward error correction code (FEC) etc is used to solve the reliability problem Using WKA(weighted key assignment) a new method is proposed to meet the requirement using a layered key tree with different weight Based on the analysis of the requirement of group rekey and WKA, a method of an adaptable group rekey is put forward This method uses a prefix code in a key tree The location of the changed node can be easy to calculate in the tree This gives an accurate basis on how to layer the tree Simulation result shows that the method has an advantage over WKA