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Image encryption/decryption system

A technology for encrypting keys and images, applied in transmission systems, image communication, digital transmission systems, etc., and can solve problems such as inability to find out, unrealistic security and/or convenience, encryption, etc.

Inactive Publication Date: 2011-04-20
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not possible for the person decrypting the image to find out which key was used to encrypt what local area, and having the person encrypting the image provide the key to the person descrambling the image is a problem in terms of security and / or convenience. impractical

Method used

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  • Image encryption/decryption system
  • Image encryption/decryption system
  • Image encryption/decryption system

Examples

Experimental program
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Embodiment Construction

[0031] The present invention is designed to construct a system including a key management server for managing encryption keys, thereby enabling decryption to be safely performed without loss of encryption even if a plurality of partial areas are encrypted with different encryption keys convenience.

[0032] Next, specific solutions will be described.

[0033] A system according to the present invention includes an encryption device for encrypting an image, a decryption device for decrypting the encrypted image, and a key management server for managing keys. The encryption device and the decryption device mentioned in this specification can be used in other than personal computers (PCs) such as copiers (including hybrid copiers), facsimile machines, printers, scanners, overhead readers, portable phones, personal The function of the present invention can be realized by combining the functions of the present invention in digital assistant (PDA), digital video camera or other equ...

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PUM

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Abstract

The invention relates to an image encrypting / decrypting system. When decrypting an image of a part of a document that is encrypted and therefore illegible, a user uses a decryption apparatus (15) to read the document as an electronic image and also to receive a user authentication by accessing a key management server (11). Then, the user transmits a management number obtained from the image to the key management server (11) from the decryption apparatus (15). The key management server (11) extracts position information of the portion of the document that is encrypted and a decryption key for decrypting this portion from a key management database (13) and transmits the decryption key to the decryption apparatus (15). The decryption apparatus (15) processes the electronic image by using theposition information and decryption key received from the key management server (11) so as to decrypt the encrypted part so that it is legible.

Description

technical field [0001] The present invention relates to an image encryption / decryption system for preventing information leakage to a third party by visually encrypting a part of important information such as personal information for digital images and images printed on printed matter. Background technique [0002] In the development of the information age, leakage of confidential information has become a serious problem, and thus, it is necessary to develop technologies for preventing information leakage. For digital data, for example, technologies for encrypting data to make the contents invisible if a third party obtains the information have been developed; some of these technologies have been used as useful means for preventing information leakage. [0003] Meanwhile, techniques for preventing leakage of information from printed matter printed on paper and the like have not been sufficiently developed, and there are no examples of commercialized products. Half of all in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/32H04L29/06H04L9/32G06F21/00G06F21/16G06F21/60G06F21/62
CPCH04N1/4486H04N1/4426G09C5/00H04N1/4413H04L9/083H04N1/444H04L9/32H04L9/14
Inventor 仓木健介福井宏治阿南泰三中澙昌平
Owner FUJITSU LTD
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