| 摘要 |
PROBLEM TO BE SOLVED: To reduce a frequency in confirmation about insecurity of a file attached to an e-mail when opening the file, while collateralizing security.SOLUTION: When an e-mail received by a client 10 has an attached file, a determination part 12 collates route information included in header information of the e-mail with a white list including route information of secure mails to determine whether insecurity of the attached file should be analyzed or not. When it should be analyzed, an information addition part 13 adds an analysis object flag to the attached file. When a file opening detection part 15 detects user's file opening operation, a file transmission part 16 transmits the file to a server 20 if the analysis object flag is added to the file. An analysis result reception part 17 receives the analysis result of insecurity of the file from the server 20. A file opening determination part 18 stops opening the file in the analysis result showing insecurity but opens the file in the analysis result not showing insecurity. |
