论文标题:多播安全中几个关键问题研究
Research on Some Key Issues of Multicast Security
论文作者 田春岐
论文导师 杨波,论文学位 硕士,论文专业 密码学
论文单位 西安电子科技大学,点击次数 561,论文页数 58页File Size2623k
2004-01-01论文网 http://www.lw23.com/lunwen_48466587/ 多播安全;组密钥管理;认证
Multicast security;Group key management;Authentication
随着互联网的发展和宽带网络的普及，多播通信由于其高效、快捷的数据传输技术而得到越来越广泛的应用。多播是一种群体间进行通信的方式，介于单播和广播之间。相对于单播和广播来说，多播具有节省带宽、减轻网络负载、减少拥塞等的优点，所以成为近些年研究的热点和焦点。 安全问题一直是多播技术发展中一个亟待解决的问题。在所有的多播安全问题中，多播组密钥管理和认证是研究的两个焦点问题。本论文基于这两个方面，主要研究成果如下： 对目前存在的多播组密钥管理方案进行了详细的研究分析，尤其是逻辑密钥分层(LKH)和单向函数树(OFT)方案，并给出OFT方案不能前向保密和后向保密的依据。 提出一种组成员逐层分组，层层管理的管理体制，比较表明它具有用户持有密钥数少，可以防止组管理者单点失效、以及具有良好可扩展性等优点。 提出一种采用单向哈希链结合完全平衡树的分层密钥管理方法，比较表明它在密钥更新时通信次数较少，是一种高效的密钥管理方案。 分析了目前的一些多播认证方案，特别针对数字签名技术进行了详细的研究。
With the development of Internet and popularity of broadband network, multicast communication is getting into wide application because of its efficient and timely data transmission. Multicast is a communication technique between unicast and broadcast, which have the advantage of economizing bandwidth, easing network burden and decreasing congestion.Multicast security is an urgent problem now, of which group key management and authentication are two core problems. Following are the main results of this thesis:1 Detailedly analyze some related schemes concerning group key management and authentication, especially logical key hierarchy(LKH) and one-way function tree(OFT). We point out the reasons that OFT fails to provide forward and backward security.2 A new group key management scheme based on grouping and management layer by layer is proposed. In comparison with the previous schemes, we find that it can prevent single point failure and also has good performance of key storage and scalable property.3 A new group key management scheme based on a full and balanced tree scheme in conjunction with one-way hash chain is proposed. By comparison, we find that it has good performance of low re-key communication costs and scalable property.4 Analyze some authentication schemes , especially some based on digital signature.
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