| 摘要 |
PROBLEM TO BE SOLVED: To enable the result of alteration checking on monitor data to be surely confirmed at a terminal. SOLUTION: In a client terminal 3, signature verification processing is conducted by a signature verification part 341 on the basis of image data and its signature ID sent from an image storage apparatus 2, to respectively determine, based on the verification result, the possibility that the signature is altered and that a public key is incorrect. Then, a message showing the determination result or a mark or symbol in place of the message is generated by a verification result display control module 343 and superimposed on the image data to be displayed on a display 36. Moreover, verification results of respective frames constituting one image data stream are stored in a storage module 32 by a storage control module 33, and the list of the stored verification results is displayed on the display 36 as a report dialog by the verification result display control module 343. COPYRIGHT: (C)2009,JPO&INPIT
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