So it is necessa1y to studyil1g deeply of natiol1al appropriative opefation information network security under tl1e studying of security system principle w1ich is universal relation , aj1d tl1e real circumstances of such nets of naoin , this tl1esis advances a secllrity demand al1d tactics to meet the naoin . lt laid special stress on sttlciyi11g basic principle and technology of pkl / ca ( public key infi ' astructlire / certificatiol1 autllority ) , and tl1e way wliich cai1 be used i11 naoin . and it dctailed discuss tl1e way that would be coming tttie in u1e tra1sfornlil1g believable cl1viro11mel1t of inner naoin , wllich is using parca tech11ique 本文通过对普遍适用的安全体系原理及国家专用业务信息网这类特定信息系统的实际情况的研究，提出满足国家专用业务信息网的安全需求和安全策略；重点研究了pki ca的基本原理和技术，及其在国家专用业务信息网中的实现方法，详细论述了利用pki ca技术改造本单位专用业务信息网的可信任环境的实现方法；最后对基于ca的pmi (授权管理基础设施)及其与pki的关系进行了探讨。
