| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To execute data transmission while protecting security through a network. <P>SOLUTION: This communication device 12 is connected to a network to perform data communication with an external device. The communication device 12 includes an exchanging means 44 for exchanging security sharing information to be used in secure communication with the external device and storing the security sharing information in a storing means, and a re-establishment judgement means 48 for making the exchanging means 44 exchange new security sharing information again when either the communication device 12 or the external device detects that the sharing of the stored security sharing information has been eliminated and detects that the sharing of the security sharing information has been eliminated. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
