| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain improvement in the reliability for monitoring operation by keeping the confidentiality of monitoring data high at all the times by holding a common key to be in a state of less likely to leake and preventing the confidentiality of the common key from lowering, even if the common key is leaked. <P>SOLUTION: Each of Web camera apparatuses CM1-CM5 newly comprises a common key table 25a, a program for detecting changes in the monitoring operation, and a common key generating program 26b. A common key, generated by each of the Web camera apparatuses CM1-CM5 itself, is stored to the common key table 25a; and if a change in the monitoring operation is detected in a state by the program 26a for detecting the change in the monitoring operation, a new common key is generated by the common key generating program 26b. The common key stored in the common key table 25a is then updated to the new common key. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
