| 摘要 |
PURPOSE:To prevent the interference of information and to attain excellent protection of information, by referencing a matrix formed with a storage key and an access key in page unit and a binary tree and the like so as to determine the propriety of write to a page or the like. CONSTITUTION:A binary tree is formed with the storage key SKEY at each page of a main memory 100 of a paging table 104 and an access key SKEY of a program managing table 105, and the maximum level key KEY0 and the like at the uppermost order is allocated in a supervisory program accessing all pages and the lowest level KEY 8 and the like is allocated in an application program, and the other KEYs 108 form the matrix for a common program where the cross point goes to 1 level when the rewrite is permitted. By referencing the binary tree and matrix, the determination of the propriety of rewrite of pages and the rewrite of the access key and the like are done and the page information is protected in excellent way without interference of various programs. |
