Trusted Query Method Based on Authorization Index and Triangular Matrix in Big Data.

Owing to the increasing of XML data on the web, the security search for a shared XML document in the cloud becomes a central issue in the database and information retrieval. In this paper, a new authorization and trusted query method is proposed to finish the security search for big data, which uses index vector to represent the authorization of content and uses the triangular matrix to represent XML’s structure. It not only provides the authorization of content but also considers the structure information. At the same time, query vector is created based on query keywords in order to improve the speed of search, and with the help of triangular matrix and authorization index, which also can efficiently speed up the process of search. Experiment shows that this method has good performance in security search for big data.