Visual password lossless information hiding and extracting method and system
A visual cryptography and information hiding technology, 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: 2021-09-24
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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[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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[0087] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0088] The purpose of the present invention is to provide a method and system for extracting lossless information hiding of visual cryptography, 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 comprehensible, the present invention will be further described in detail below in conjunction with the accompanying draw...
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The invention relates to a visual password lossless information hiding and extracting method and system. The hiding method comprises the following steps: building a laminated imaging light path; converting the initial hidden 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; scrambling the first visual key image and the second visual key image into a first messy code image and a second messy code image; converting the two messy code images into a first two-dimensional code image and a second two-dimensional code image; segmenting the two two-dimensional code images, loading the plurality of segmented images to a spatial light modulator, and transmitting the plurality of segmented images to the laminated imaging light path through a beam splitter to generate a plurality of diffraction images; and scrambling a plurality of diffraction images, multiplying by an attenuation factor, and embedding the attenuated out-of-order diffraction images as phase information into the two host images. According to the invention, coding process errors can be reduced and decoding quality can be improved.
Description
technical field [0001] The invention relates to the field of information security, in particular to a method and system for extracting lossless information hiding of visual cryptography. Background technique [0002] Information encryption and anti-counterfeiting technology is an important content in today's information security field, among which 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, some optical security technology patents appeared in the United States. These patents are mainly used in fields such as identity verification and anti-counterfeiting. [0003] In the late 1980s, American BanknoteHolographic used holographic anti-counterfeiting technology to produce Visa and MasterCard credit cards, which met the needs of the trade and financial fields at that time. Over the next ten years, rainbow holographic anti-counterfeiting technology h...
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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