| 摘要 |
PROBLEM TO BE SOLVED: To limit access to a file by a secret data processing system which operates in real time by allowing access to file data when a digital signature for discriminating data of a file system matches a read-out digital signature. SOLUTION: The file system incorporated in this data processing system includes a file system driver 12 as part of an operating system 10 for executing application 11, and this driver 12 manages reading and writing operation from and to the disk drive 14 of a physical storage device 15. Then data of this file system has a digital signature for discriminating the data and algorithm for calculating the real signature of the data is checked. Then when this signature for discrimination matches a digital signature read out of the file system, access to the file data is allowed. |
