Prototyping of Secure and Reliable Multicast System

安全可靠的组播系统原型设计

基本信息

批准号：
13558041
负责人：
SATO Fumiaki
金额：
$ 3.26万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13558041/
关键词：
Multicast Security FEC 高信頼マルチキャスト全順序マルチキャスト

项目摘要

Recently, the use of a decentralized application has become general by the development of the computer networks. The totally-ordered group communication service is effective and it is necessary and indispensable to design a decentralized application. For the privacy protection in the totally-ordered group communication service, we have proposed the method of renewing the group key of the totally-ordered multicast protocol which considers synchronization by all members. The multicast group is composed of two or more domains with two or more members and one key delivery server (KDS) in the method, and KDS takes the responsibility of delivering the group key to the member in the domain that oneself manages. If some assumptions are filled, this method can be applied to any totally-ordered multicast protocol. However, the loss of the packet which can happen because of an actual communication is not considered in this method. The group key request of the member increases if the packet is lost when the group key is delivered. And, the group key request becomes a bottleneck, and the performance of the entire system is downed. Then, to deliver the group key efficiently by adding the function of FEC(Forward Error Correction) to the key delivery in this research, and adding a tedious parity packet beforehand under the environment with the packet loss, the group key delivery method based on the push has been improved. However, the loss, rate on an actual network changes. If a lot of parity packets are given in the environment with a low loss rate, the bandwidth is consumed. Moreover, if the parity packet is few in the environment with a high loss rate, most members are not original packet restorable. It proposed the method of dynamically changing the parity packet to correspond to the change in such a loss rate, and the effectiveness was evaluated.

最近，随着计算机网络的发展，分散式应用程序的使用已变得普遍。全序群组通信服务是有效的，设计去中心化应用是必要且不可或缺的。针对全序组通信服务中的隐私保护，提出了考虑所有成员同步的全序组播协议组密钥更新方法。该方法中的组播组由两个或多个具有两个或多个成员的域和一台密钥传送服务器(KDS)组成，KDS负责将组密钥传送给自己管理的域内的成员。如果满足一些假设，该方法可以应用于任何全序组播协议。然而，该方法没有考虑由于实际通信而可能发生的数据包丢失。如果组密钥下发时丢包，则成员的组密钥请求会增加。并且，组密钥请求成为瓶颈，整个系统的性能下降。然后，为了高效地传递组密钥，本研究在密钥传递中添加了FEC（前向纠错）功能，并在丢包的环境下预先添加了繁琐的奇偶校验包，提出了基于推送得到了改进。然而，实际网络上的损耗率会发生变化。如果在低丢包率的环境下给出大量的奇偶校验包，就会消耗带宽。而且，如果在丢包率较高的环境中奇偶校验包较少，则大多数成员都无法恢复原始包。提出了动态改变奇偶校验数据包以对应丢失率变化的方法，并评估了其有效性。