Abstract: [PROBLEMS] To prevent leak of information because loss or theft judgement is made whether or not read control information stored in a predetermined read control information storage area of an external storage is proper. If the judgment result shows that it is invalid, virtualized data stored in the external storage is decrypted, and genuine read control information virtualized in the virtualized data is extracted. Next judgement is made whether or not the extracted genuine read control information is proper. If the extracted genuine read control information is proper, the virtualized genuine data in the virtualized data along with the genuine read control information is made usable by decrypting and creating the virtualized data, and improper read control information is stored in the read control information storage area.
Abstract: [PROBLEMS] To more infallibly prevent leak of information because loss or theft. [MEANS FOR SOLVING PROBLEMS] It is judged whether or not read control information stored in a predetermined read control information storage area of an external storage is proper. If the judgment result shows that it is invalid, virtualized data stored in the external storage is decrypted, and genuine read control information virtualized in the virtualized data is extracted. It is judged whether or not the extracted genuine read control information is proper. If the extracted genuine read control information is proper, the virtualized genuine data in the virtualized data along with the genuine read control information is made usable by decrypting and creating the virtualized data, and improper read control information is stored in the read control information storage area. The proper genuine read control information and genuine data are encrypted to create virtualized data.
Abstract: It is possible to reduce the danger of information leak caused by remaining cache data. An information processing device (1) includes: data communication means (17) which performs data communication with a server computer (4) via a data communication network (5); storage means (15) which can temporality store data transmitted and received at least to/from the server computer (4); and information processing means (12) which executes information processing based on the data transmitted or received to/from the server computer.