METHOD FOR HIDING INFORMATION INSIDE INFORMATION STORAGE MEDIUM, CIPHERING METHOD, CIPHERING SYSTEM AND INFORMATION STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a means capable of relatively easily and secretly storing the large capacity of cipher key information inside a storage medium without destroying a reservation area on the storage medium. SOLUTION: By understating (9FFCH) the size information (total sector number: A000H) of this information storage medium to an operating system by a device driver for the information storage medium, an area which can not be accessed by the operating system is set inside a data area. In the area, the cipher key information for ciphering or deciphering data inside the information storage medium is stored.