| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult to analyze a key data necessary for generating verification data of image data. SOLUTION: When a user switches on the power of an imaging device 10, the key data necessary for generating the verification data is generated (step S201). When the user switches off the power of the imaging device 10, the key data are deleted (step S204). As a result, since the period for retaining the key data in the imaging device 10 can be restricted to the period of the power of the imaging device 10 turned on, analysis of the key data can be made difficult. COPYRIGHT: (C)2004,JPO |
