SECURITY DEVICE HAVING TAMPER RESISTANCE AGAINST FAILURE UTILIZATION ATTACK

摘要

PROBLEM TO BE SOLVED: To provide a security device which is configured such that a memory position where a computer program for conducting a secret operation is mounted is changed every time the secret operation is conducted.;SOLUTION: A security device 1 includes: a nonvolatile memory (ROM122) which stores a secret operation module executable code 100 for conducting a secret operation; and a secret operation control unit 101 which determines at random a memory position for arranging the secret operation module executable code 100 among the memory allowing read and write of data, when call of the secret operation module executable code 100 is received from superordinate software 11, loads the secret operation module executable code 100 stored in the nonvolatile memory to the memory position, then executes the secret operation module executable code 100 loaded to the memory position, and transfers the execution result of the secret operation module executable code 100 loaded to the memory position to the superordinate software 11.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT