Image generating device, image file generating method, image verification device and image verification methode

Abstract

An image generation apparatus includes an image file generating unit operable in one of first, second and third modes, wherein (a) if the first mode is selected, the image file generating unit generates a first image file including image data and first verirfication data used to verify whether the image data is falsified or not, (b) if the second mode is selected, the image file generating unit generates a second image file including the image data, additional information of the image data and second verification data used to verify whether the additional information is falsified or not, and (c) if the third mode is selected, the image file generating unit generates a third image file including the image data, the additional information, the first verification data and the second verification data. A selector is adapted to select one of the first, second and third modes, and a verification data generating unit is adapted to generate the first verification data using secret information and the image data and to generate the second verification data using the secret information and the additional information, and the additional information includes information relating to the image data.

Description

technical field [0001] The present invention relates to an image generating device capable of verifying whether additional information of image data has been altered, an image file generating method, an image verifying device, an image verifying method, and the like. Background technique [0002] In recent years, digital cameras that digitize and store optical images of subjects have been put into practical use. [0003] It is easy to input image data captured by a digital camera into a personal computer, but there is a problem that it is also easy to change on a personal computer. Therefore, the reliability of image data taken with a digital camera is lower than that of silver halide photographs, and the credibility of evidence is poor. Therefore, in recent years, a digital camera system having a function of adding a digital signature to image data captured by a digital camera has been proposed. Conventional digital camera systems are disclosed in, for example, US Patent ...

AI Technical Summary

Problems solved by technology

[0003] It is easy to input the image data captured by a digital camera into a personal computer, but the problem is that it is also easy to change it on the personal computer.

[0004] However, conventional digital camera systems cannot generate a digital signature or MAC (Message Authentication Code) of image data and a digital signature or MAC of additional information of the image data, respectively.

There is a problem that it is not possible to verify whether the image data has been changed and whether the additional information has been changed separately

That is to say, even if the user wishes to determine whether the image data has been changed, the additional information of the image data has been changed, or both the image data and the additional information have been changed, the digital camera system cannot determine

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