| 摘要 |
<p>PURPOSE:To significantly increase reliability against the falsification of data stored by himself by setting the change traces information corresponding to the storage data to the condition to show that the change traces are present when the storage data are changed. CONSTITUTION:When a data rewriting action request is executed from an external part, the data rewriting processing is executed for the area designated, and when the processing is completed, area definition information to define the designating area is referred to and the change traces information added to the area definition information is set to the condition in which the change traces are present. When the access request of data reading is executed, the area definition information to define the designated area is referred to, and it is checked whether or not the change traces information added to the area definition information is set to the condition in which the change traces are present. When the information is set to the condition in which the change traces are present, it is judged that the storage data in the area are changed and processing is executed based on such changes.</p> |
