CODE KEY MANAGING APPARATUS

摘要

PURPOSE: To prevent a cipher key from being altered by a third person with ease by inputting switch information on a physical key switch and the comparison output of a specific information comparing means and allowing the cipher key to be written only when the switch information is on and the comparison output indicates a coincidence. CONSTITUTION: The specific information is held by a specific information holding means 21 and the specific information comparing means 22 compares this specific information with externally inputted information. This physical key switch information and the comparison output of the specific information comparing means 22 are inputted to a cipher key writing control means 23 and when the physical key switch 25 is on and the comparison output shows a coincidence, the cipher key held by the cipher key holding means 11 is allowed to be written. Therefore, the physical key switch 25 is turned on with the physical key 24 and only when the coincidence is obtained by the specific information comparing means 22, the writing to the cipher key holding means 21 is allowed. Consequently, it becomes difficult for a person other than a ciphering device administrator to write the cipher key.