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A Reversible Information Hiding Method for Encrypted Image Based on Quadtree Dynamic Block Segmentation

An encrypted image and information hiding technology, which is applied in the field of reversible information hiding of encrypted images based on quadtree dynamic block segmentation, can solve the problems of high computational complexity, small algorithm embedding, poor encryption security, etc., and achieve low algorithm complexity , Reduce the difficulty of management, the effect of large steganographic capacity

Active Publication Date: 2020-06-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0003] However, through the research on the existing methods, it is found that most of the current methods have small embedding amount and high computational complexity, and cannot separate the texture area and smooth area of ​​the image well, and cannot make full use of the natural image correlation, which leads to algorithm embedding small amount
In addition, high computational complexity and poor encryption security are also common flaws of existing methods

Method used

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  • A Reversible Information Hiding Method for Encrypted Image Based on Quadtree Dynamic Block Segmentation
  • A Reversible Information Hiding Method for Encrypted Image Based on Quadtree Dynamic Block Segmentation
  • A Reversible Information Hiding Method for Encrypted Image Based on Quadtree Dynamic Block Segmentation

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are 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 shall fall within the protection scope of the present invention.

[0058] RRBE reserves space before encryption, and hides information directly in the reserved space after encryption; VARE hides secret information in the encrypted domain directly after image encryption. Since the encrypted image entropy value is generally high, it is difficult for VARE to construct a large amount of space, and most of the reversible information hiding methods for plaintext images can be applied to the RRBE method, so this method can make full use of the natural image. Reserve enough space for redundancy.

[0059] A...

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Abstract

The invention relates to an encrypted image reversible information hiding method based on quadtree dynamic block segmentation. The method comprises the following steps: 1) reserving a space before image encryption by using a quadtree dynamic block segmentation method; 2) carrying out scrambling and encryption on the image by adopting a chaotic stream password; (3) carrying out information hiding on a scrambled and encrypted image, (4) extracting hidden information, 4(5) generating a decryption-password-carrying image for the image from which the hidden information is extracted, replacing a bit, and carrying out image restoration. compared with the prior art, the method has the advantages of simplicity in implementation, high safety, high steganography capacity and the like.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to a method for reversible information hiding of encrypted images based on quadtree dynamic block segmentation. Background technique [0002] In recent years, with the development of network, cloud computing and other technologies, traditional image encryption and plaintext information hiding methods have gradually been unable to meet people's strong demand for information security. Encryption technology and information hiding technology do not conflict with the security protection of carrier transmission, but complement each other, so they can be combined to achieve double protection of carrier transmission. Reversible information hiding methods for encrypted images can be mainly divided into two categories, namely reserving space before encryption (RRBE, reserving room before encryption) and vacating room after encryption (VARE, vacating room after encryption). R...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/32H04L9/08H04L9/00
CPCH04L9/001H04L9/0863H04L9/0869H04N1/32272
Inventor 吴海斌栗风永周刚魏为民李晋国
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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