Research Of Secure Multicast Key Management Based On Fault-tolerant Scheme

With the rapid development of Internet, the multicast technology has been applied widely, such as video conference, financial market date, long-distance teaching. Among all the secure issues in this technology, security multicast is becoming the focus of recent researches. And multicast key management is the crux of solving the security problems in multicast.The n-party GDH.2 multicast key management protocol is studied in-depth in this paper, and then the following problems is concluded:lack of certification, vulnerability to insider attacks, and a single-point failure, which meat the weakness of fault-tolerant. This paper introduces the fault-tolerant algorithm and the password authentication mechanism to settle the issues above. The proposed protocol is a fault-tolerant and secure multicast key management (FTS, for short). Failure detector is used to dynamically test the members, which ensures that FTS will be independent from the location and the status of group members. In addition, each member has a unique password with the server, which is used to encrypt or decrypt the massages in FTS and TF Arithemtic updates the messages among members, which could effectively prevent insider attacks. Finally, to compare multicast key management schemes, communication cost, computation cost, memory cost and security are taken as the performance criteria. Through theoretical and instantiation analysis, we compare our protocol with the FTKM from the four aspects above.FTS slightly increases the computation cost, but greatly reduces the storage cost. In conclusion, FTS enhances the comprehensive performance, which is also a fault-tolerant and secure protocol without the single-point bottleneck.