改进了安全级比较的规则，使得更适合现实中空间数据存取控制的需求。
Improve the rules of comparing the security label, which meet the practical demand of the Access Control for spatial database.
PK I技术能够有效满足网络应用中的机密性、完整性、真实性及不可否认性和存取控制等安全需求。
PKI can effectively meet many safety requirements for confidentiality, integrality, facticity an acceptability and access control for network applications.
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