SECRET ANALYSIS DEVICE, SECRET ANALYSIS SYSTEM, SECRET ANALYSIS METHOD, AND SECRET ANALYSIS PROGRAM

摘要

An encryption device (50) generates a cipher text ct obtained by encrypting information x with use of an encrypted token etk. A decryption key generation device (60) generates, by using a decryption token dtk corresponding to the encrypted token etk, a decryption key dk from a user secret key sk in which a vector y has been set. A secret analysis device (70) decrypts the cipher text ct generated by the encryption device (50), by means of the decryption key dk which has been generated by the decryption key generation device (60), and generates a calculation result of a vector x and the vector y.