In this paper, from information security requirement analysis, constructing information security model is put forward through ring upon ring decomposing and progressively thinning method.
文章通过对信息安全的需求分析，提出了对信息安全需求用层层分解、逐步细化的方法来构造信息安全模型。
Security requirement analysis is a very important part of software vulnerability analysis technology, it points out the analysis direction and improves efficiency.
安全需求分析是软件漏洞分析中极重要的一个环节，能够指明分析的方向，提高分析的效率。
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