A color image encrypting and embedding method based on a discrete domain

Abstract

The invention provides a color image encrypting and embedding method based on a discrete domain and relates to digital image processing techniques. The method comprises the steps of introducing a secret image feature coefficient to Logistic chaotic mapping and Rabinovich hyperchaotic mapping and making generated sequences associated with the secret image; rearranging the RGB order of the image byusing the generated Logistic chaotic sequences to eliminate color information of the color image; encrypting the image pixel positions by using a group of sequences in four groups of chaotic sequencesgenerated by Rabinovich hyperchaotic mapping, and using a block scrambling method to encrypt the image quickly; scrambling and diffusing a low frequency coefficient obtained after discrete wavelet transform (DWT) of the image by using the remaining three groups of Rabinovich hyperchaotic sequences in different channels; embedding the encrypted image into a DWT high frequency coefficient of a public image by using the least significant bit replacement algorithm (LSB). The method can effectively protect the existence of image information and guarantees the security of an image in a communication process on the basis of protecting the security of image content.

Description

technical field [0001] The invention relates to the field of digital image security, in particular to a color digital image encryption and concealment method. Background technique [0002] At present, multimedia is an important tool for information exchange, and a large number of digital images are disseminated in open networks represented by the Internet and wireless networks, which greatly facilitates information access and sharing. At the same time, the transmission of image information in many sensitive fields, such as commercial, scientific research, military and political, has huge security risks in an open network environment, and it is often subject to various potential human attacks, including Illegal acquisition, tampering, etc. will lead to serious consequences. Therefore, it is very important to protect the security of image information. There are two main aspects to the protection of image information, one is to encrypt the image information to protect the priv...

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Problems solved by technology

[0005] The study found that in the existing technology, the single, low-dimensional chaotic map has the disadvantages of insufficient key space and low sequence complexity. At the same time, if the encrypted image is directly transmitted in the open channel, it will not easily detected by attackers

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