XML数据库的安全查询处理

当今XML数据库查询系统必须处理快速增长的数据量和大量的用户,如果使用细粒度级别的访问控制保护敏感XML数据,则查询效率会较低,因为当用户视图需要计算得出时,很难对XML文档的每个节点实施访问控制。提出一个安全的XML查询方案,它使用缓存存储查询结果和安全信息。用户查询重写为安全的系统查询,依据缓存是否命中,决定在缓存还是源XML文档上执行得到查询结果;提出一个新的缓存替换策略LSL,它基于安全级别对缓存更新。实验结果表明,该方案能显著地改进查询系统性能。

DEALING WITH SECURE QUERYING OF XML DATABASE

Current XML database querying systems have to deal with a rapidly growing amount of data and a large number of users.When user's view needs to be computed,it is difficult to enforce access control on each node in an XML document because the query efficiency is lower if the access control is used to protect sensitive XML data at a fine-grained level.This paper puts forward a secure XML querying scheme,which uses cache to store query results and security information.User queries are rewritten to secure system...