| 摘要 |
PROBLEM TO BE SOLVED: To safety and efficiently change the cipher system of data. SOLUTION: The enciphering/deciphering device is provided with a management part 12 capable of managing the identification information of enciphered data and the information of the cipher system and a key, and deciding the necessity of the rewriting of the cipher system for each enciphered data, a key storing means (main) 13 for storing a key for decoding, an enciphering/ deciphering means (main) 14 for deciphering the enciphered data by the present cipher system by using the key in the key storing means (main), a key storing means (sub) 15 for storing a key for re-encipherment of the data deciphered by the ciphering/deciphering means (main), a key storing means (sub) 16 for re-ciphering the data by a new cipher system by using the key in the key storing means (sub), and a control part 11 for transmitting the inputted enciphered data to the enciphering/deciphering means (main), and for controlling the enciphering/deciphering means (main) based on the decided contents of a managing means to output the deciphered data, or to transmit the data to the enciphering/deciphering means (sub).
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