| 摘要 |
PURPOSE:To avoid receiving an adverse influence from the backup function of a power source, to be easily restored and to surely prevent illegal program analysis. CONSTITUTION:This program analysis preventing device is composed of a high-order device 10 provided with a key input part 11 inputting a ciphering key, a ciphering key storage part 12a storing and holding the ciphering key, a program editing part 12b deciphering a program ciphered in accordance with the ciphering key and a control part 15 controlling each part, and a terminal equipment 20 provided with a program storage part 21a storing and holding an operation program, a ciphering key storage part 21b storing and holding the ciphering key, a program editing part 21c ciphering the operation program in accordance with the ciphering key and a control part 24 controlling each part. |
