ENCRYPTED DATABASE SYSTEM AND ENCRYPTED DATA MANAGEMENT METHOD

摘要

Provided is an encrypted database system wherein: a database wrapper unit converts a plain text SQL statement for searching encoded data to an encoded SQL statement for processing the encoded data on the center system; in the center system, a database controller searches a hash table and limits the scope of the encoded data by executing the received encoded SQL statement; an encoded text match comparison unit performs a match comparison, specified by the encoded SQL statement, on the encoded data the scope of which was limited; the database control unit transmits the encoded SQL statement execution results to a user system; and the database wrapper unit decodes the received SQL statement execution results and outputs the encoded data search results.