说明：  网络安全的解决是一个综合性问题，涉及到诸多因素，包括技术、产品和管理等。本文主要研究了信息安全现状及发展趋势，信现代息系统中的信息安全其核心问题是密码理论及其应用，其基础是可信信息系统的构作与评估。
(Network security solution is a comprehensive problem, involving many factors, including technology, products and management. This paper mainly studied the information security status quo and development trend, the letter system of modern means of information security at its core questions are password theory and its application on the basis of credible information system for the configuration and evaluation.)