SECURITY TOKEN, DATA FALSIFICATION DETECTION METHOD, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a security device capable of detecting that data is falsified when a laser attack is made to falsify data stored in a memory.SOLUTION: When reading data from a data file with an error detection code is attached thereto to perform processing, control means 10 of a security token 1 reads prescribed data from the data file in a case that the data file is stored in a readable and writable memory, verifies the error detection code from the data file subjected to writing back data after writing back the read data to an original place, and executes data falsification detection processing for determining that the read data is falsified in a case that an error exists in the data file.