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针对钥-锁对访问控制方案存在的问题,基于整数二进制表示的唯一性,该文提出了一种新的双钥—锁对访问控制方案。该方案实现简单,有良好的动态特性,从系统删除一个用户(文件)时,不必保留用户(文件)行的任何信息,而直接将之删除,提高了空间利用率。而所有的双钥-锁对访问控制方案都存在严重的溢出问题,且在实现用户对文件的多种访问权限时,均假设权限具有递增关系,这使得访问控制系统不适合对文件进行细粒度保护。该方案实现了用户对文件的多种访问控制权限,并减少了溢出问题的发生。
In view of the key-lock access control scheme existing problems, based on the uniqueness of integer binary representation, this paper presents a new double-key-lock access control scheme. The scheme is simple and has good dynamic characteristics. When a user (file) is deleted from the system, it is not necessary to retain any information of the user (file) line and delete the information directly, which improves space utilization. However, all the double-key-lock access control schemes have serious overflow problems. When implementing multiple access permissions for the files, all assume that the permissions have an increasing relationship, which makes the access control system not suitable for fine-grained files protection. The program to achieve a variety of user access control files, and reduce the overflow problem.