Encrypted image reversible information hiding method based on integer wavelet transform

A technology of wavelet transform and information hiding, which is applied in the field of information hiding and image encryption, can solve the problems of low peak signal-to-noise ratio of payload, low payload, high maximum payload, etc., achieve good results, good encryption performance, and large information capacity Effect

Active Publication Date: 2020-09-01
SHANDONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But it has a low payload and is less robust against common non-geometric attacks
The document "S.Yiand Y.C.Zhou, Binary-block embedding for reversible data hiding in encrypted images" (Signal Processing, Article vol.133, pp.40-51, Apr 2017) proposed a reversible encrypted image b

Method used

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  • Encrypted image reversible information hiding method based on integer wavelet transform
  • Encrypted image reversible information hiding method based on integer wavelet transform
  • Encrypted image reversible information hiding method based on integer wavelet transform

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specific Embodiment

[0158] key generation

[0159] If the secret information w of size m×n is hidden in the image I of size M×N, the key K 0 Consists of four parts: {z 0 ,s,d,rs l},z 0 is the initial value of the chaotic system. s and d are the parameters used to extract the sequence during hiding and encryption. RS l (l=1,2,...,m×n) is a recovery sequence that ensures that the confidential data can be extracted and the original image can be fully recovered, which will be produced in the information hiding step. For the proposed chaotic system, its initial value z 0 According to the image information, its calculation formula is shown in formula (2):

[0160]

[0161] Among them, mod(*, *) represents the remainder operation of two numbers, rf is the sum of horizontal pixel differences, cf is the sum of vertical pixel differences, and the calculation process is as formula (3):

[0162]

[0163] In addition, the parameters s and d when selecting the sequence are calculated by formulas ...

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Abstract

The invention discloses an encrypted image reversible information hiding method based on integer wavelet transform, and belongs to the field of information hiding and image encryption, and the methodcomprises the steps: firstly generating a position sequence, an encryption sequence and a scrambling sequence through employing a proposed chaotic system; performing integer wavelet transform on the image to obtain four components, hiding data in diagonal components according to a position sequence, encrypting approximate components through an encryption sequence, and finally performing position scrambling on all the components by using a scrambling sequence; in the encryption process, by researching the reconstruction process of integer wavelets, providing an image encryption method based oninteger wavelet transform and the problem that pixels overflow when encrypted wavelet components are reconstructed is mainly solved. Simulation experiment results show that the scheme has better performance, including higher embedding rate, safer secret images, visual quality of decrypted and extracted images and anti-attack performance, and has practical value.

Description

technical field [0001] The invention belongs to the fields of information hiding and image encryption, and in particular relates to a method for reversible information hiding of encrypted images based on integer wavelet transform. Background technique [0002] Reversible information hiding focuses on reversibility. While protecting the confidentiality of information, it ensures that the extracted data and extracted images are lossless. At the same time, under the growing demand for information security, it aims at the growing demand for digital security in the fields of confidential communication and medical information transmission. The sequence generated by the chaotic system has a good random distribution, and it is used to encrypt the image to ensure the security of the hidden information in the encrypted image. The encryption method in the wavelet domain can improve the unpredictability of the scheme and make the ciphertext image not easy to be cracked. The nature of ...

Claims

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Application Information

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IPC IPC(8): G06F21/60H04N1/32H04L9/00
CPCG06F21/602G06F2221/2107H04L9/001H04N1/3217
Inventor 刘连山孟令壮
Owner SHANDONG UNIV OF SCI & TECH
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