| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To transmit confidential information so as to be disclosed only to persons concerned and to safely store it as the confidential information irrespective of a storage place also in an information processor on the receiving side. <P>SOLUTION: The confidential information is stored as an encryption file, only generate information is stored as a plaintext file, execution environment for processing the confidential information is separated from execution environment for processing the general information, propriety of all access is decided by the following policy and encryption processing is performed if necessary. (1) Authority to decrypt the encryption file and writing authority of the plaintext file are not provided to access subjects under the same execution environment. (2) Writing authority always accompanying decryption is provided to the access subject to which authority to decrypt the encryption file is provided. (3) Authority to decrypt the encryption file and authority of network access are not provided to the access subjects in the same execution environment. (4) Neither encryption authority nor decryption authority of the file is provided to an access subject used for copy and transfer of the file. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
