| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent distribution of false data or acquisition of data by a third party without using a server device for sharing, and to cope with a case wherein a transmitter cannot accurately input a password for authentication and is not authenticated. <P>SOLUTION: Authentication for transmission is performed by a first communication terminal 2, a scheduled sentence message is transmitted when the authentication is satisfied, and a specific message is transmitted when not satisfied. A second communication terminal device 3 performs the authentication for reception, displays the scheduled sentence message or the specific message when the authentication is satisfied, and displays a substitutional message when not satisfied. A user 5 of the second communication terminal device 3 sees the display of the specific message to know that the sender is not authenticated in transmission. In the substitutional message, a regular user recognizes that the authentication is not performed, but the third party cannot understand it. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
