【作者】 张松林；

【导师】 沈明玉；

【作者基本信息】 合肥工业大学 ， 计算机应用技术， 2007， 硕士

【摘要】 计算机网络技术的迅猛发展，为企业共享全球范围内的信息和资源提供了方便，有效降低了企业的运营成本并改变了传统的工作模式。随着企业内部网络的日益庞大及与外部网络联系的逐渐增多，传统的集中式、静态网络安全体系已经不能满足需要，一个安全可信的企业网络安全系统显得十分重要。本文首先阐述了网络信息所面临安全问题，并对影响网络安全的各种因素进行了较为深入研究，同时对当前的网络安全技术作了简单的介绍。根据华环国际烟草有限公司信息化建设的需要，针对企业网络系统的升级改造进行深入调研，分析了企业局域网络现状，网络系统升级后所面临的安全问题，阐述了网络系统升级设计的安全策略。运用先进的网络安全技术(如防火墙技术、IDS、YPN技术等)、安全设计理念，对企业网络的升级改造进行安全性设计。本文从体系结构的角度出发，用系统工程的方法，根据系统环境及应用的实际需求，提出综合处理和安全解决方案。从升级系统的安全需求角度出发，在协议栈的每一层都采用一定的安全机制来提供安全服务。在系统升级设计过程中，充分分析了系统的安全需求，制定相应安全策略，并采用相应的安全技术手段来加以实现。更多还原

【Abstract】 With the help of the rapid development of the network, the sharing of the information and resource became easier and easier, the operating costs of the enterprise became lower and lower, the traditional mode of work also changed. The Centralized and static network security system unable to provide enough services to the enterprise as the Intranet and the contact with the outside grew huger. The importance of a safe and reliable enterprise network security system is more obvious.Firstly, this dissertation expounds the problems in network information security, researches the factors which impact the security of network and introduced the recent network security technology. According to the situation of Huahuan International Tobacco companies, the upgrade and status of enterprise network system and the problems after the update are studied. After these researches a safety strategy of the network system is raised. By the advanced security technology of the network (such as firewall technology, IDS, VPN, etc.) and the safety design concept, the security of upgrading work is designed.Based on the system environment and its applications, a solution is presented by the architecture technology. Consider the security require of system upgrade, the security services are provided in every protocol stack layer. The security require of the system is fully analyzed in the system updating design. The system is realized by the corresponding security technology with the guiding of safety strategy.更多还原