INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD, AND PROGRAM

摘要

An information processing device is equipped with: a storage unit, which holds a tree structure with which identification information for identifying documents is stored in nodes; and a registration unit, which receives documents containing identification information for identifying a document and containing a collection of words, and receives keys, and which registers the identification information in a leaf node of the tree structure, and determines secure indexes with respect to the identification information registered in each node from the root node to said leaf node in the tree structure on the basis of the collection of words and the key, and which generates search indexes for the document by adding the secure indexes that have been determined, and adds the search indexes generated with respect to each of multiple received documents and stores the result in the storage unit as a search index with respect to the multiple documents. The information processing device generates a keyword search index that is resistant to information leakage.