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In this paper, the concept of network security and security structures of OSI and Internet is introduced, and various threats confronting the computer network are also discussed. Several kinds of network information security technologies, including firewall technology, virtual private network, intrusion detection system, data encryption technology, identity authentication and security protocol etc. are also examined. The security of internal network is the biggest problem in the construction of each network. The solution to this problem lies in setting up a firewall. The theory of a firewall and the approach to its actualization is studied. Intrusion detection system, an important part of the computer network security system, has gained extensive attention. IDS monitors the computer and network traffic for intrusion and suspicious activities. It not only detects the intrusion from the extranet hacker, but also the intranet users. The emergence of virtual private network paves the way for realizing secure connection of LAN quickly and at a relatively low cost. The concept, function, key techniques, including the tunnel technology, and the ways to realize VPN are expounded in this paper. Also introduced is the data encrypt network technology, which is called the soul of computer network security, such as digital digest, digital signature, digital certificate, digital encrypt arithmetic and so on. At the same time, the principle and the process of implementing network security by digital certificate and digital signature, the basic principle and characters of security protocols, and finally, three of the security protocols, concerning the security problems in network, IPsec, SLL and SET are analyzed in detail Computer network system should be a system of dynamic defence, both dynamic and static, passive as well as active, and even offensive, combined with management and technology.

本文系统地介绍了网络安全的概念、OSI及Internet的安全体系结构，并讨论了计算机网络面临的各种安全威胁；内部网络的安全问题是每个建网单位面临的最大问题，可以认为防火墙技术是解决网络安全的一个主要手段，本文研究了防火墙的原理及其实现手段；作为一种主动的防御措施，入侵检测系统作为网络系统安全的重要组成部分，得到了广泛的重视，TDS对计算机和网络资源上的恶意使用行为进行识别和响应，不仅检测来自外部的入侵行为，也监督内部用户的未授权活动；虚拟专用网技术的出现，为实现网络间的连接提供了快速安全但又相对便宜的手段，本文较深入的探讨了实现VPN的隧道技术，并对VPN的概念、功能、实现途径、基本构成、关键技术及发展前景等问题进行了全面论述；数据加密技术是网络安全核心技术之一，本文从数据加密算法、数字摘要、数字签名及数字证书等几方面简要介绍了数据加密技术，并分析用数字证书和数字签名实现网络安全的原理和过程；对安全协议的基本原理、主要特点进行了较为深入的研究，并就网络的安全性问题剖析了三种安全协议：IPsec协议、SLL协议和SET协议。

D. Copy the certificate and private key to a separate directory, and delete the private key from the main directory on the computer.

还应该理解Microsoft建议使用的用於保护使用者的Rivest-Shamir-Adleman资料夹内容的存放原则。

While analyzing the integrated evaluation of private universities, the article will discuss the purpose, meaning and the significance of the evaluation about developing private universities. The socialism direction of running education along with teaching domination and the principle of regular management is illustrated in the thesis too. The significance of integrated evaluation is thoroughly explained in purpose for reform, construction, combination, and optimized development.

在分析民办高校综合评价时对评价目的与意义以及评价对发展民办高校的重要性进行讨论，阐明了必须坚持社会主义办学方向，坚持以教学为中心，规范管理为原则，分析了综合评价的重要意义，以达到以评促改、以评促建、评建结合、优质发展的共同目的。

The dualist division of gender has resulted in a hierarchal spatial division in the society between the public and private spheres, a separation of the dominant public male realm of production from the subordinate private female one of reproduction.

社会上性别的二元对立思维导致社会空间的等级分配，即社会空间一分为二，公共的、生产的、支配性的空间属于男性，而私人的、生育的、从属性的空间则属于女性。

An summarization has been produced to the present situation of Chinese game copyright system and an enlightment is derived from the related foreign systems by analysing the correlated codes in game copyrights among foreign international private law, edge act and Chinese international private law.

通过介绍美日等游戏产业大国关于游戏版权保护的立法状况、国际条约中关于游戏版权保护的状况、再结合我国游戏版权保护立法现状及不足，从而得出一些启示。

This paper employs Amano and Wirjanto's(1997,1998)model of permanent income to estimate intra- temporal and inter-temporal elasticity of substitution of government and private consumption,and then studies the relation between government and private consumption during 1960～2003 in China.

要本文以 Amano 和 Wirjanto 永久性收入模型为基础，研究1960～2003年期间中国政府消费与居民消费之间的期内替代弹性以及两者各自的跨期替代弹性，并结合新的理论发展，检验政府和居民消费之间的互补关系。

Notwithstanding the focus of its enabling act "on the role of the private sector in providing affordable housing," the MHC details a far-reaching so-called public housing reform - which in actuality would significantly enlarge the role of the private sector, thereby significantly increasing the cost of affordable housing provision and unnecessarily dismantling PHAs that are already effectively providing public housing.

MHCs报告缺乏文档的大量资金，其私有化提议会访问尽管其授权法案的焦点"角色的私营部门提供住房、"MHC的细节深远的所谓的公有住房改革——这实际上会大大扩大私人部门的作用，从而大大增加保障性住房成本和不必要的规定拆除艾滋感染者已经有效地提供公共住房。

MHCs Report Lacks Documentation of the Amount of Capital That Its Privatizing Proposals Would Access Notwithstanding the focus of its enabling act "on the role of the private sector in providing affordable housing," the MHC details a far-reaching so-called public housing reform - which in actuality would significantly enlarge the role of the private sector, thereby significantly increasing the cost of affordable housing provision and unnecessarily dismantling PHAs that are already effectively providing public housing.

MHCs报告缺乏文档的大量资金，其私有化提议会访问尽管其授权法案的焦点"角色的私营部门提供住房、"MHC的细节深远的所谓的公有住房改革——这实际上会大大扩大私人部门的作用，从而大大增加保障性住房成本和不必要的规定拆除艾滋感染者已经有效地提供公共住房。

With the private economic developing rapidly, Political Participation of Private Enterpriser is inevitable, and at the same time, normal.

随着私营经济的迅速发展，私营企业主政治参与是必然的，也是正常的。

However, the proportion of Americans with private housing, only 68 percent, lower than China, many Americans will be 50 years of age to sell the house, only 10% of the people to retain private housing, apart from the Americans did not inheritance to their children's habits, the also because the United States a large number of estate duty.

但是，美国人的比例与私人住宅中，只有百分之六十八，低于中国，许多美国人将50岁以下的房子出售，只有10 ％的人保留私人住宅，除了美国人没有遗产孩子的习惯，还因为美国大量的遗产税。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。