Image encryption/decryption apparatus, method and program
First Claim
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1. An image encryption apparatus that encrypts a digital image, the image encryption apparatus comprising:
- a computer processor to execute;
specifying a partial region to be encrypted from the digital image;
converting the partial region including micro regions into a processing image based on an encryption key; and
regularly converting a pixel value of the processing image in terms of a smaller converted region of a micro region to specify a position of the micro region of the partial region, thereby generating a conversion image that specifies positions of the micro regions.
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Abstract
An image encryption apparatus encrypts a digital image by specifying a partial region from the digital image, converting the selected partial region into a processing image based on an encryption key, and specifying a position of the partial region by regularly converting a pixel value of the processing image.
18 Citations
23 Claims
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1. An image encryption apparatus that encrypts a digital image, the image encryption apparatus comprising:
a computer processor to execute; specifying a partial region to be encrypted from the digital image; converting the partial region including micro regions into a processing image based on an encryption key; and regularly converting a pixel value of the processing image in terms of a smaller converted region of a micro region to specify a position of the micro region of the partial region, thereby generating a conversion image that specifies positions of the micro regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of encrypting a digital image, the method comprising:
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specifying a partial region to be encrypted from the digital image; converting the partial region including micro regions into a processing image based on an encryption key; and regularly converting a pixel value of the processing image in terms of a smaller converted region of a micro region to specify a position of the micro region of the partial region, thereby generating a conversion image that specifies positions of the micro regions. - View Dependent Claims (18, 19, 20, 21, 22)
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23. An apparatus for encrypting a printed document, comprising:
a controller configured to; specifying a partial region to be encrypted from a digital image of the printed document; converting the partial region including micro regions into a processing image based on an encryption key; and regularly converting a pixel value of the processing image in terms of a smaller converted region of a micro region to specify a position of the micro region of the partial region, thereby generating a conversion image that specifies positions of the micro regions.
Specification