东北大学继续教育学院毕业设计(论文)

摘要

21世纪以来，人类经济高速发展，人们生活发生了日新月异的变化，特别是计算机的应用及普及到经济和社会生活的各个领域。随着计算机在社会生活各个领域的广泛运用，计算机已普遍应用到日常工作、生活的每一个领域, 互联网的应用变得越来越广泛。但随之而来的是, 计算机网络安全也受到前所未有的威胁。如病毒入侵、恶意代码、群发恶意短信、盗取他们的信息，信息的泄露问题也变得日益严重等。据报道，世界各国遭受计算机病毒感染和攻击的事件数以亿计，严重地干扰了正常的人类社会生活，给计算机系统带来了巨大的破坏和潜在的威胁。计算机病毒攻击与防范技术也在不断拓展，更新和完善。防范计算机病毒将越来越受到各国的高度重视。为了确保系统的安全与畅通，计算机网络的安全性问题就越来越重要。因此，计算机网络安全是目前的首要问题。本文着重从以下几个方面就计算机网络安全进行初步的探讨。

关键词：计算机网络安全；防火墙；病毒

Abstract

Since the 21st Century, the high-speed development of human economy, people living there have been changes change rapidly, especially the computer 's application and popularization to economical and social life each domain. Along with the computer in the social life each domain's widespread utilization, the computer has been widely applied to the daily, in every area of life, the increasingly widespread use of internet. But there is computer network security has also been hitherto unknown threats. Such as viruses, malicious code, sending malicious message, stealing their information, the disclosure of information is becoming increasingly serious. According to the report, the world suffer the computer virus infection and the attack event hundreds of millions, seriously disturb the normal life of human society, to the computer systems have brought tremendous damage and potential threat. The computer virus attack and its prevention technology is continuing to expand, update and improve. Guard against computer viruses will be more and more countries are highly valued. In order to ensure the safety and smooth flow of the system, the computer

network security problem is becoming more and more important. Therefore, the security of computer network is the most important issue. This paper from the following aspects of computer network security is discussed.

Key words: security of computer network ; firewall; virus

目录

摘要........................................................................................... I 1.绪论 (1)

1.1网络安全的概述、重要性及网络安全的不安全因素和在当今

网络安全要考虑的几个方面 (2)

1.1.1网络安全的概述 (2)

1.1.2网络安全的重要性 (3)

1.2. 网络安全的不安全因素和在当今网络安全要考虑的几个

方面 (5)

1.2.1安全威胁网络的不安全因素 (5)

1.2.2在当今网络安全要考虑的几个方面 (9)

2.国内外的发展状况 (10)

2.1国内外的发展状况 (10)

3.网络安全的防范技术 (13)

3.1防火墙技术 (13)

3.1.1防火墙的主要功能 (14)

3.1.2防火墙的主要优点 (15)

3.1.3防火墙的主要缺陷 (15)

3.1.4 防火墙的部署 (16)

3.1.5防火墙的局限性 (17)

3.2 入侵检测技术 (18)

3.2.1入侵检测系统的分类 (19)

3.2.2 目前入侵检测系统的缺陷 (20)

3.2.3入侵检测系统的优点 (20)

3.2.4入侵检测系统的局限性 (21)

3.2.5 防火墙与入侵检测系统的相互联动 (22)

3.3数据加密技术 (23)

3.4病毒防护体系 (25)

3.4.1计算机病毒及其特征 (25)

3.4.2 计算机病毒的危害和种类 (27)

3.4.3网络计算机病毒的特点和防治 (27)

3.4.4网络环境下病毒的传播 (29)

4总结 (30)

参考文献 (31)