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A lossless information hiding extraction method and system for visual cryptography

A visual cryptography and information hiding technology, which is applied in the field of lossless information hiding and extraction of visual cryptography, can solve the problems of large errors in the encoding process and low decoding quality, and achieve the effect of avoiding large errors and improving decoding quality

Active Publication Date: 2022-08-09
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method and system for extracting lossless information hiding of visual cryptography to solve the problems of large errors in the encoding process and low decoding quality

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  • A lossless information hiding extraction method and system for visual cryptography
  • A lossless information hiding extraction method and system for visual cryptography
  • A lossless information hiding extraction method and system for visual cryptography

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Embodiment Construction

[0087] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0088] The purpose of the present invention is to provide a lossless information hiding extraction method and system for visual passwords, which avoids the problem of large errors in the encoding process and improves the decoding quality.

[0089] In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to...

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Abstract

The invention relates to a lossless information hiding extraction method and system for visual passwords. The concealment method includes: building a stacked imaging optical path; converting initial concealment information into an initial two-dimensional code image; expanding pixels in the initial two-dimensional code image into a first visual key image and a second visual key image; A visual key image and a second visual key image are scrambled into a first garbled image and a second garbled image; the two garbled images are converted into a first two-dimensional code image and a second two-dimensional code image; two two-dimensional code images are split code images, and load the multiple segmented images onto the spatial light modulator, and transmit the multiple segmented images to the stacked imaging optical path through the beam splitter to generate multiple diffraction images; The scrambled diffraction images are multiplied by an attenuation factor, and the attenuated scrambled diffraction images are embedded into the two host images as phase information. The invention can reduce the coding process error and improve the decoding quality.

Description

technical field [0001] The invention relates to the field of information security, in particular to a lossless information hiding extraction method and system for visual passwords. Background technique [0002] Information encryption and anti-counterfeiting technology is an important content in today's information security field. Among them, optical and photoelectric information encryption and anti-counterfeiting technology are favored by people because of their parallelism, high speed and low cost. In the 1970s, a number of optical security technology patents appeared in the United States. These patents are mainly used in the fields of body verification and anti-counterfeiting. [0003] In the late 1980s, American BanknoteHolographic used holographic anti-counterfeiting technology to make Visa and MasterCard credit cards to meet the needs of the trade and financial fields at that time. In the following ten years, rainbow holographic anti-counterfeiting technology has been...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/32H04N5/268H04N7/22
CPCH04N5/268H04N7/22H04N1/32203H04N1/32267H04N1/32288
Inventor 史祎诗李勇于涵张峻浩杨栋宇吕文晋
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES