安全多播中可靠的密钥传送协议

针对安全多播中的密钥传送问题，提出了一种可以满足可靠性、实时性和可扩展性要求的传送协议，该协议充分利用了逻辑密钥分层结构的特点．在传送密钥时，根据接收者的数量赋予密钥不同的权重，并由此确定了不同的前向差错控制（FEC）的编码冗余度，从而使接收者数量较多的密钥具有更高的可靠性．协议的性能分别通过独立丢包模型和突发丢包模型进行了分析和模拟，结果表明，利用该协议不仅可以减少延迟，而且也显著降低了通信开销，在不同丢包概率下的通信开销平均降低约30%．

Reliable Cipher Key Transport Protocol for Secure Multicast

Aiming at the problem of the cipher key delivery in secure multicast,a transport protocol that exploits the properties of logical key hierarchies to meet the requirements of reliability,real-time and scalability was presented.When updated keys are delivered,they are assigned to different weights based on the number of their receivers,and the different redundancy of FEC(forward error correction) encoding is determined,thus the keys that have more receivers will have more reliability.The performance of the proposed protocol was analyzed and simulated using independent loss model and burst loss model,respectively.The result shows that it not only can reduce latency,but also can averagely reduce communication overhead by 30% for different loss rates.