| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enhance the security of communication by reducing the possibility of illegal access after the authentication of a user device. <P>SOLUTION: In this authentication system 1, even when it is decided that a user device 12 is a legal user device once by an authentication device 11, the validity of the user device 12 is decided several times while data as the object of transmission are transmitted and received. In this authentication system 1, the possibility of illegal access after authentication is reduced, and the security of communication is enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
