PORTABLE STORAGE MEDIUM, PROGRAM, INFORMATION PROTECTION SYSTEM FOR THE PORTABLE STORAGE MEDIUM AND INFORMATION PROTECTION METHOD FOR THE PORTABLE STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To enhance reliability to information protection of a portable storage medium.SOLUTION: This portable storage medium 1 includes a controller part 2 and a storage part 3. The storage part 3 includes a protection target storage area 4. The storage part 3 stores prescribed authenticating information N. The controller part 2 controls reading and writing of the information of the storage part 3. The controller part 2 includes a function of blocking reading of information of the protection target storage area 4. The controller part 2 has an information reading permission decision function of taking in prescribed information from an installed device, confirming that the taken-in information is information fit for a prescribed condition already authenticated by prescribed authentication processing, and making reading blocking operation of the information of the protection target storage area 4 be released when deciding that a combination between the already authenticated information and the authenticating information N satisfies a prescribed combination condition.