| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent execution of unnecessary encipherment processing when encipherment processing becomes redundant. <P>SOLUTION: An encipherment execution control system comprises: first encipherment means which executes encipherment on communication in a first interval between a terminal device and a first relay device; second encipherment means which executes encipherment on communication in a second interval including the first interval from the terminal device to a second relay device via the first relay device; and control means which when encipherment for the second interval is executed, controls the first encipherment means so that the encipherment for the first interval is not executed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
