| 单词 | Bell-La Padula model |
| 释义 | Bell-La Padula modelIn computer security, a formal transition model of computer security policy that describes a set of access control rules. In this formal model, the entities in a computer system are divided into abstract sets of subjects and objects. The notion of a secure state is defined, and it is proven that each state transition preserves security by moving from secure state to secure state; thus, inductively proving that the system is secure. A system state is defined to be “secure”, if the only permitted access modes of subjects to objects are in accordance with a specific security policy. In order to determine whether or not a specific access mode is allowed, the clearance of a subject is compared to the classification of the object, and a determination is made as to whether the subject is authorized for the specific access mode. The clearance／classifica- tion scheme is expressed in terms of a lattice.; 计算机安全学中一种计算机安全政策的形式变换模型,描述了一系列存取控制规则。在这 个模型中,一个计算机系统实体被分为主体和客体的抽象集,定义了安全状态的概念,只在安 全状态间进行移动,由此证明状态变迁保证安全性,进而证明系统是安全的。当主体对客体的 容许存取模式与安全性政策一致时,系统状态定义为“安全”。为确定某个存取模式是否合 法,必须把主体的容许与客体的分类信息进行比较,并决定某种存取模式对主体来说是否合 法。这种容许／分类关系图是以格子的形式表达的。 |
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