Research Of XML Security Access Control Technology Based On XML Keyword Search

XML keyword search provides a simple interface similar to search engine,and users only need to input the query keyword to get what they want without providing schema and writing query expression.It has aroused lots of attention widely that how to handle XML keyword search efficiently.SLCA was proved to be an effective method in many query semantics that experts and scholars put forward.A considerable number of Research is based on keyword search method and make continuous improvement in terms of search algorithms.There are a lot of experts dedicated to optimizing the query on the returned results,for example,the query results are sorted.They strive to meet the needs of users to get more results.With development of XML and keyword search technology,the problem of security risks has been taken into account.They mainly focus on XML encryption and access control technology.This paper combines XML security with keyword search technology,and describes a XML access control method based on view.The view is relatively common and efficient access control technology,which is used to hide or delete the contents that are not allowed to access by visitors and only show the data that are allowed to access.For a given XML document and its corresponding structure template DTD,the system administrator can define and describe a variety of security access policies.Different access policies are based on different users,and specifically indicate which data node is allowed to be accessed,which is not allowed to be accessed and which are conditionally accessed in the document.Specific access policies are implemented by safety rules.Safety rules are used to describe XML constraint semantics which can be understood as improvements of DTD based query instructions limited.Security view describes a conversion result of XML document DTD by safety rules,which may be derived from security rules by view exporting algorithm,so it is in line with secure access specification.Keyword search results based on SLCA semantic are processed through the method of the secure view,which determine XML keyword search results safe.It is given the security constraints corresponding to a specific XML document,and describes security access rules based on DTD,and draw the security view correspondingly.Keyword search results based on SLCA semantic and obtained by ILE algorithm are processed through the definition of security view,which weeds out nodes do not meet the view and get safer query data.This paper has designed and implemented the keyword query system which achieve the keyword search processing algorithms ILE and get security query results.And the experimental results were tested using three different data sets and the efficiency and feasibility of the method were verified from the efficiency point of time.