Abstract: A system capable of surely preventing a theft or leak of information which comprises: an information registration destination decision unit deciding registration destinations of information; a distribution unit information generation unit generating distribution unit information pieces; and a plurality of storage grids connectable to the distribution unit information generation unit.

Abstract: All conceivable problems associated with user authentication can be coped with at least individually by preventing spoofing as the result of leakage of authentication information through interception of communications, monitoring, stealthy glance, brute-force attack, and beyond the control of the user and outside the system, duplication and forgery of authentication information by carrying out an “authentication method that can cope with every possible problem in relation to authentication, excluding monitoring” and an “authentication method authentication having the possibility of spoofing by the authenticating side though there is no danger of monitoring and he possibility of spoofing as the result of theft of authentication information from the authentication device” in two stages in one user authentication processing, and “preventing spoofing by the authenticating side and as the result of theft of authentication information from the authentication device by establishing a collatable and irreversible rela

Abstract: A method and mechanism enables viruses invading from a network to be erased prior to arrival at the server; and hackers are prevented from making remote control on the server. A storage device is provided between a server and a network connected to the server, so that data may be temporarily stored in the storage device. Also, a switching device is provided on the input and output sides of the storage device respectively. The switching device is capable of performing on-and-off switching operations in the state of being isolated electrically. The switching device is so controlled as to input data in the storage device while the switching device turns ON on the input side, and while the switching device turns OFF on the output side of the storage device and process the data thus inputted in the storage device while the switching device turns OFF both on the input and output sides of the storage device.