Taking China Disease Control and Prevention Information System for example, the paper introduces the target and definition of information security hierarchy protection, concretely elaborates the main contents from the following aspects: information system status investigation, risk evaluation, overall planning and design, level assessment, etc.%以中国疾病预防控制信息系统为例,介绍信息安全等级保护工作的目标与定义,从信息系统情况调研、风险评估、安全总体规划设计、等级测评等方面具体阐述信息安全等级保护主要内容。
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