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Image encrypting device, image decrypting device, method and program

An encryption device and encryption key technology, applied in image communication, secure communication device, encoding/decoding device, etc., can solve problems such as limitations, and achieve the effect of improving the strength of security

Inactive Publication Date: 2010-03-24
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, an electronic authentication system that constructs a powerful authentication server and securely exchanges public keys using the authentication server has already been put into practical use. However, this method of using the authentication server is different from the general simple authentication system for individual users in structure. are very different, so users who can enjoy the technology of the invention of Patent Document 1 are limited

Method used

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  • Image encrypting device, image decrypting device, method and program
  • Image encrypting device, image decrypting device, method and program
  • Image encrypting device, image decrypting device, method and program

Examples

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Embodiment Construction

[0063] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0064] First, the basic configuration of the image encryption device of the present invention will be described.

[0065] {Basic structure of the image encryption device of the present invention}

[0066] figure 2 It is a figure showing the basic structure of the image encryption apparatus of this invention.

[0067] The image encryption device 40 of the present invention has: an input unit 41, an encryption area designation unit 42, an image conversion unit 43, a public key acquisition unit 44, a key encryption unit 45, an information embedding unit 46, a pixel value conversion unit 47, and an output unit 48.

[0068] The input unit 41 inputs data to be encrypted and converts it into an image (hereinafter referred to as an input image). The input image is, for example, an image in the form of a bitmap. Data input to the input unit 41 is, for example, document dat...

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Abstract

An image encrypting device according to the present invention generates a finally encrypted image sequentially by converting an image of a specified region in an input image with an encryption key, byembedding information obtained by encrypting the encryption key with a public key pairing with the private key of a transmission destination, and by performing pixel value conversion. Then, the encrypted image is transmitted to the transmission destination as a printed matter or via a network. An image decrypting device according to the present invention converts the encrypted image in the form of print data or electronic data into an image, and inputs the image. Next, the image decrypting device extracts a decryption key (the encryption key) from the image of the encryption region by executing a process reverse to the process of the image encrypting device according to the present invention for the encryption region of the encrypted image converted into the image data. Then, the image decrypting device decrypts the original image of the encrypted region by using the decryption key, and restores the entire encrypted image.

Description

technical field [0001] The present invention relates to a technique for securely exchanging printed matter or electronic data in which important information such as personal information is visually encrypted. Background technique [0002] With the development of social informatization, leakage of confidential information has become a serious problem, and the importance of technologies for preventing information leakage has increased. Regarding this information leakage technology, for example, a technology for encrypting data has been developed such that even if a third party obtains digital data, its contents cannot be known. This encryption technique has been utilized as an effective means for preventing information leakage of digital data. [0003] On the other hand, technologies for preventing information leakage of printed matter printed on paper media or the like have not been sufficiently established, and there are no practical examples. In modern society, there are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08G06F21/24G09C5/00H04L9/30G06F21/60G06F21/62
CPCG09C5/00G06F21/608H04L9/08H04N1/4486H04L9/30H04L9/0825H04L9/14H04L2209/88G06F21/6245H04L9/0861
Inventor 阿南泰三仓木健介中潟昌平
Owner FUJITSU LTD
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