| 摘要 |
PROBLEM TO BE SOLVED: To prevent a software from being analyzed even when a third person knows the information data of a microprocessor stored in a memory. SOLUTION: This device is provided with a microprocessor 11, ROM 2 for storing the information data (software) for operating this microprocessor and a reading means for reading the information data out of the ROM 2 and reading them into the microprocessor, and the reading means is provided with a data converting circuit 12 for converting the information data read out of the ROM 2 based on prescribed rules and reading them into the microprocessor 11. When the original information data to be read into the microprocessor 11 are inversely converted based on the prescribed rules in advance and stored in the ROM 2, information data completely different from the original information data are stored in the ROM 2 and even when the third person knows the information data in the ROM 2, it is difficult to analyze the original information data of the microprocessor. |
