Hitachi Solutions, Ltd.

Tateki Harada

Hiromasa Hashimoto

Atsuo Inoue

Yuzo Oshida

Provided is an information leakage prevention technique which does not require a dedicated device for access management on a network, and which offers excellent security policy flexibility. An information leakage prevention system comprises: a client terminal including a client processing unit which performs network control in accordance with an acquired security policy; and a management server including a user database in which information concerning a user of the client terminal is stored, a security policy database in which a security policy defining a network control content for each attribute of the user is stored, and a server processing unit which selects the security policy on the basis of the attribute of the user and a time of delivery of the security policy, and which transmits the selected security policy to the corresponding client terminal.

Information leakage prevention system and method

A cipher processing system for allowing file access while maintaining the integrity without a user being aware of the difference between files when the user accesses a file in a folder containing both a ciphertext file and a plaintext file. If a folder stores both a ciphertext file and a plaintext file, the ciphertext file is attached with identification information (preferably, footer information) indicating that the file is a ciphertext file, so that a plaintext file and a ciphertext file can be differentiated from each other when the files are read. A deciphered file gained by removing identification information from a ciphertext file and deciphering the file is delivered to an upper-level application. If the read file is a plaintext file, decipher processing is not executed on the plaintext file but the plaintext file is passed to the upper-level application program.

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Tokyo, Japan

Tateki Harada