然而，现有的组播安全协议仅能提供部分的解决方法。
Yet, existing security protocols for multicast offer only partial solutions.
群密钥分配的动态安全性一直是组播安全研究的重点和难点。
Dynamic security of group key distribution is always the key point and difficult point in the research field of multicast security.
组播安全问题包括：数据保密、组管理和访问控制、源认证等多个方面。
The issue of multicast security consists of data confidentiality, group management, data source authentication and so on.
组播技术包括了组播组、组播地址、组播协议、组播可靠性和组播安全性等很多方面的内容。
Multicast technology includes a number of aspects, such as multicast group, multicast address, multicast protocols, multicast reliability, multicast security, etc.
组播通信源认证是组播安全中的重点和难点问题之一，但目前没有一种方法能够满足所有组播应用领域的需求。
Source authentication is an important and difficult problem in multicast security, but no approaches can satisfy all applications now.
介绍了基于组播的安全协同多会话交谈系统的设计与实现。
This paper introduces the design and implementation of group secure cooperative multi-session system based on multicast.
基于非精确网络下门限更新策略，提出一种将安全性和组播树代价相结合的路径选择函数。
Under threshold based link state update policy, this algorithm presents a new path - selection function which combines the safety and cost of a path.
而组密钥管理是安全组播的核心问题之一。
Group key management is one of the kernel problems in secure multicast.
安全是多播研究中急需解决的问题。本文对多播安全中认证和组密钥管理这两个关键问题进行了研究。
Because of the importance and urgency of security to multicast, this thesis investigates two key issues, i. e. authentication and group key management, of multicast security.
安全组播目前主要采用基于密钥树的组密钥管理算法。
The key tree based group key management algorithms are widely used in secure multicast.
首先本文深入研究了安全组播中基于密钥树的组密钥管理算法。
First of all, this dissertation extensively studied the group key management algorithms based on key tree in secure multicast.
文章通过分析组播的安全问题和安全服务，给出了设计体系结构中需要注意的问题。
By analyzing the issues of secure multicast and secure services, this paper states problems of secure multicast architecture which need to be noticed.
由于IKE设计之初致力于点对点之间的安全参数协商，应用于IP组播情况有许多局限之处。
Since the IKE is only addressed to protected negotiation of pairwise security data at the beginning, it has some demerits at communication based on IP multicast services.
该文在分析组播通信安全需求的基础上，提出一种基于密钥矩阵的组播密钥管理方案。
According to the analysis of the security demand of multicast communication, a multicast key management scheme based on key matrix is proposed.
针对分层组播协议存在的自利型攻击问题，提出了一种安全分层组播协议，设计了基于拥塞状态的访问控制算法。
Aiming at the self-beneficial attack problem in layered multicast protocol, a secure layered multicast protocol is presented. The congestion state related access control algorithm is designed.
其安全架构能够提高多层组播服务的安全性和可管理性。
The framework improves the security and management of multi-layer multicast services.
然而，这是以带来重要的组播基础设施安全漏洞为代价实现的。
However, this is achieved at the expense of introducing an important security hole in the multicast infrastructure.
提出了一种基于组播频道跳变的安全特定源组播通信方案。
This paper proposes a secure source specific multicast scheme based on multicast channel hopping.
多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。
Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.
组播有着很广阔的应用前景，越来越多的组播应用对组播提出了安全性要求。
The multicast applications are going to be widely adopted, and more and more applications need multicast provide them with secure solutions.
组播是面向群组接收者的首选网络通信技术，但缺乏安全机制限制了组播在各种网络业务中的广泛应用。
Multicast is the current prime network technique focusing on the group receivers, but the absence of security mechanism has limited its application in various network services.
组播会话描述信息的有效组织、会话通告的传输效率以及组播会话的安全管理都成为问题。
On the other hand, how to organize the session description information effectively, transmit session announcement efficiently, and secure the session are more and more of a problem.
在分析现有的组播密钥管理方案的基础上，提出了基于子群的安全组播密钥管理方案。
On the based of analyzing the existing key management scheme, it proposes a key management scheme based on subgroup for secure multicast.
指出了组播通信的安全要求，分析了现有组密钥方案的优缺点。
The security requirements of multicast were presented, the advantages and disadvantages of presented schemes were analyzed, and several main research directions were pointed out as well.
IP多播组密钥管理问题是IP多播安全的核心问题。
IP multicast group key management is essential for the IP multicast security.
目前针对IP组播的安全访问控制问题的解决方案只是实现了对组播接收者的访问控制。
The current secure access control techniques in IP multicast just implemented the access control to multicast receivers.
提出一个应用椭圆曲线密码体制进行密钥协商而在基于身份的公钥系统内进行组通信的全新安全组播方案。
In this paper, we propose a novel secure multicast scheme with key agreement based on Elliptic Curve Cryptosystem and group communication inside Identity-based Public key Cryptography system.
在组播通信中，如何实现有效的分配、管理安全通信的密钥是组播密钥管理的研究范畴。
In multicast communication, how to distribute and manage keys for secure communication is the research scope of multicast key management.
现有的组播路由技术很难保证这一点，所以安全组播仍然是一个热点。
The existing multicast routing is difficult to guarantee this, so it is still a hot spot for Secure multicast.
现有的组播路由技术很难保证这一点，所以安全组播仍然是一个热点。
The existing multicast routing is difficult to guarantee this, so it is still a hot spot for Secure multicast.
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