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Ciphertext domain reversible data embedding method based on pailliar public key encryption system

A public key encryption and encryption algorithm technology, applied in transmission systems, image data processing, digital transmission systems, etc., can solve the problems of small embedding capacity and can not meet the needs of practical applications, and achieve the effect of improving the embedding rate and increasing the embedding capacity.

Active Publication Date: 2017-11-24
ANHUI UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the capacity of embedding information in digital images still needs to be improved. To embed some additional information in a certain digital image, Li Ming and Li Yang proposed a very simple mapping method for information embedding after plaintext expansion. However, the embedding capacity is small and cannot meet the needs of practical applications.

Method used

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  • Ciphertext domain reversible data embedding method based on pailliar public key encryption system
  • Ciphertext domain reversible data embedding method based on pailliar public key encryption system
  • Ciphertext domain reversible data embedding method based on pailliar public key encryption system

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Embodiment 1

[0064] Such as Figure 1 to Figure 5 As shown, a method of reversible data embedding in a ciphertext domain based on the pailliar public key encryption system in this embodiment includes encrypting the original image with a public key to obtain a ciphertext image, performing homomorphic operations on the ciphertext domain, and embedding information , Extract the embedded information and restore the original image without loss;

[0065] It mainly includes the following steps:

[0066] (1) Encrypt the original image with the public key to obtain the ciphertext image, and perform homomorphic operations on the ciphertext domain to complete the histogram expansion of the extended plaintext.

[0067] (1-1) If figure 2 As shown, in the original image, there are 14 pixels with a gray value of 0, 12 pixels with a gray value of 1, and 16 pixels with a gray value of 2. Firstly, each pixel m(i,j) in the data image is encrypted using the Pailliar public key encryption system. Suppose ...

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Abstract

The invention discloses a ciphertext domain reversible data embedding method based on a pailliar public key encryption system. The method comprises the following steps in sequence: encrypting an original image with a public key through the pailliar public key encryption system to obtain a ciphertext image; performing a state operation on a ciphertext in a ciphertext domain of the ciphertext image according to the homomorphism of the pailliar public key encryption system; after finishing encryption and extension of a digital image, embedding information of two bits into an extended image; and extracting the embedded information and recovering an original image in a lossless way. The embedding capacity of embedding one bit into each pixel of an x-axis symmetrical region in the ciphertext domain can be increased to the embedding capacity of embedding two bits into each pixel, and an image into which information is embedded can be recovered into an original recovered image in a lossless way.

Description

technical field [0001] The invention belongs to information encryption technology, in particular to a method for embedding reversible data in a cipher text domain based on a pailliar public key encryption system. Background technique [0002] In recent years, the rapidly progressing society has driven the rapid development of network technology. Today, the Internet has become an integral part of our daily lives. The open network environment carries the data of the number of sands in the Ganges River. There are many types of data, and the information mixed in the data is also pouring into the daily life of human beings. [0003] Nowadays, encrypting data images and embedding some other information in data images is not a difficult problem. The homomorphic encryption system is a system that can not only guarantee data privacy but also be used for reversible information embedding according to its own homomorphism. Reversible data hiding occupies an important part in informat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04N19/467G06T9/00
CPCG06T9/00H04L9/008H04N19/467
Inventor 殷赵霞贾玉洁高莉莉纪远
Owner ANHUI UNIVERSITY
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