SAFETY ASSESSMENT DEVICE, SAFETY ASSESSMENT METHOD, AND PROGRAM

摘要

The safety of a database that conceals large-scale data is efficiently assessed. A database storage (10) stores an original database and a secure database. A neighbor record search part (11) obtains a neighbor record set by a neighbor search of the original database for each record in the secure database. A nearest neighbor record calculation part (13) calculates a distance between each record in the secure database and each record in the neighbor record set and obtains a nearest neighbor record. A re-identification determination part (14) calculates a re-identification rate of a record based on whether the record in the original database corresponding to each record in the secure database matches the nearest neighbor record. A re-identification rate calculation part (15) calculates a re-identification rate of the secure database based on the re-identification rate calculated for each record in the secure database.