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组播以其独特的优势，在网络通信方面的应用越来越广泛，但随之而来的就是安全问题，其中密钥管理是最基本的问题之一。本文研究了安全组播中的密钥管理问题。介绍了现有的两种主要解决方案，即SKDC方案和密钥树管理方案，并分析了它们的不足之处，指出基于密钥树的研究方向，在此基础上提出基于Huffman密钥分级树的密钥管理方案，将布尔函数的分析方法运用其中使管理简便化。并对该方案的性能从密钥管理的存储空间和密钥刷新通信量两个方面，给出了相应的分析。-Multicast With its unique advantages in the communication network is widely applied, but the attendant security issues, key management is the most basic one of the problems. This paper studies the security Multicast key management issues. Of the two main existing solutions, and key programs SKDC tree management program analysis of their deficiencies, that the tree on the key directions of research on this basis based on the classification tree Huffman key Key Management Program, Boolean function of the analytical method which enable the use of simple. Program and the performance of key management from the storage space and traffic Key set two, given the corresponding analysis.

学习资料，关于C++的，Addison.Wesley写的Effective.&.More.Effective.C-learning information on the C, Addison.Wesley write Effective .. More.Effective.C

Flash完全教程-Flash complete tutorial

嵌入式操作系统原理---Windows+CE-Principles of Embedded Operating System-Windows+ CE

understanding webservice，从底层了解web service的实现与应用-understanding webservice. understand from the bottom of the web service Implementation and Application

用VC++编写的学校地图信息系统，可以对道路进行查询-VC map prepared by the school of information systems, which can conduct inquiries on the road

the combination of keil and proteus

《Windows下的C/C++高级编程》的光盘，SDK入门，是学好MFC的知识准备-"Windows C/C Advanced Programming" CD-ROM entry SDK is the study of knowledge ready MFC

本wap小说系统必须运行于杰奇小说系统上，支持杰奇小说版本：1.25、1.30、1.31、1..40。完美与杰奇系统各种信息接合（用户数据、书签、藏书、积分） 与原书站系统独立，但数据共享。 支持书籍搜索。 支持用户登录； 支持阅读设置； 本系统与原杰奇完全独立，不修改原系统任何代码。-Wap novels of this system must run on杰奇novel systems to support novel杰奇version: 1.25,1.30,1.31,1 .. 40.杰奇system with perfect bonding all kinds of information (user data, bookmarks, books, points) and the original system of independent stations, but data sharing. Support for english books. Support for user login support reading settings the system with the original杰奇completely independent, without modifying the original system of any code.

AVR单片机实用C语言程序设计，面向工程，实用性强，可移植性好。-AVR Single Chip practical C language programming, project-oriented, practical, good portability.