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secure database system
相关语句
  安全数据库系统
     Secure Database System Based on Webpage Supervision and Protection
     基于网页监控与保护的安全数据库系统
短句来源
     Study on Aggregation Inference Problems in Multilevel Secure Database System
     多级安全数据库系统集合推理问题研究
短句来源
     Inference control in databases is a key field of multilevel secure database system (MLS-DBS) and is an important means to achieve database security.
     数据库推理控制是研究高安全等级的安全数据库系统的关键技术之一,是保障数据库安全的重要手段。
短句来源
     Research on Multi-Policy Secure Database System
     支持多策略的安全数据库系统研究
短句来源
     Multi-policy secure database system architecture
     支持多策略的安全数据库系统体系结构
短句来源
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  “secure database system”译为未确定词的双语例句
     A Secure Policy Model for Secure Database System Based on Extended Object Hierarchy
     基于扩展客体层次结构的安全数据库策略模型
短句来源
     The requirements of supporting multiple security policies in DBMS and the problems to be solved in order to do so are prescnted. A multi-policy secure database system architecture(MSDA) according to these problems is provided.
     提出了在DBMS中支持多种安全策略的需求,指出了在DBMS中支持多安全策略所面临的主要问题,针对这些问题提出了支持多安全策略的DBMS体系结构(MSDA).
短句来源
  相似匹配句对
     THE SEMANTICS OF MULTILEVEL SECURE DATABASE
     多级安全数据库的语义
短句来源
     Transactions in Secure Database Systems
     安全数据库系统中的事务
短句来源
     Inference Control in Secure Database
     安全数据库的推理控制
短句来源
     Database
     数据库
短句来源
     the database.
     本系统的资料都储存在数据库里。
短句来源
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Security constraints provide an effective classification policy for multilevel secure database system,they can be used to assign security levels to the data based on content,context,and time. This paper describes the techniques of constraints processing during database design,alogrithms for handling association constraints, simple constraints, logical constraints are put forward.

安全约束为多级安全数据库系统提供了一种有效的分类策略,可用来为基于时间、语境和内容的数据分派安全等级.本文讨论了数据库设计过程中的安全约束处理技术,并提出了处理基于关联的约束、简单约束和逻辑约束的算法.

Mandatory access control (MAC) plays an important role in highly secured database systems. MAC requires that all users and resources are classified and assigned a security label, which is a combination of a hierarchical security level and non hierarchical security categories. Most MAC systems use “downward read” and “upward write” as access rules, which seriously constrains data availability. Besides, there are some flaws in the rule for category control. To solve these problems and improve both...

Mandatory access control (MAC) plays an important role in highly secured database systems. MAC requires that all users and resources are classified and assigned a security label, which is a combination of a hierarchical security level and non hierarchical security categories. Most MAC systems use “downward read” and “upward write” as access rules, which seriously constrains data availability. Besides, there are some flaws in the rule for category control. To solve these problems and improve both flexibility and security, this paper introduces an enhanced multilevel security (MLS) model with extended security labels and corresponding access rules. An extended label specifies a user's clearance for read and write separately, which allows the user to read and write data of appropriate sensitivity respectively. More over, an extended security label may include multiple category sets, controlling data access from different aspects. This paper also gives the formal representations of the mandatory access control model with a series of definitions and theorems as well as its access control rules. The model presented in this paper is compared with some available commercial DBMS with MAC: Trusted Oracle 7 and DM2.

具有强制存取控制的数据库称为 B1级数据库 .强制存取控制为所有主体和客体定义一安全级 ,安全级为一分层密级和一非分层范围组成的二元组 .现有的强制存取控制系统都采用向上写向下读的策略 ,严重地影响了系统的可用性和灵活性 .此外 ,现有的对非分层范围的安全控制规则也存在着缺陷 .针对这些问题 ,文中提出一种改进的多级安全模型 ,修改了安全级的定义和相应的安全检查规则 ,从而增强了系统的安全性和可用性 .修改后的安全级定义中将读安全级和写安全级分开 ,并且可按不同分类方法定义多个非分层范围 ,从不同方面分别对数据存取进行控制

In multilevel secure database systems, the "Write Up" protocol of classic BLP model violates integrity constraints and produces covert channel and polyinstance problem. Dependencies among transactions also bring covert channels. Based on analysis of transaction security, a secure transaction model is given. Moreover, a correctness criterion for secure transactions, secure conflict serializability(SCSR) is proposed. Finally, a secure concurrency control algorithm to remove covert...

In multilevel secure database systems, the "Write Up" protocol of classic BLP model violates integrity constraints and produces covert channel and polyinstance problem. Dependencies among transactions also bring covert channels. Based on analysis of transaction security, a secure transaction model is given. Moreover, a correctness criterion for secure transactions, secure conflict serializability(SCSR) is proposed. Finally, a secure concurrency control algorithm to remove covert channels is described.

在多级安全数据库系统中经典的 BL P模型的“向上写”违反了数据库的完整性 ,并产生隐通道和带来多实例问题 .事务间的提交和回退依赖也会产生隐通道 .在对事务安全性分析的基础上提出了安全事务模型和安全事务正确性标准 -安全冲突可串行化 (SCSR) .最后给出了一个避免隐通道的安全并发控制算法

 
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