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Encryption-domain reversible information hiding method based on classified scrambling and hiding information classification

A technology for hiding information and information hiding, which is applied in the field of reversible information hiding and can solve problems such as content leakage

Inactive Publication Date: 2017-08-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, if an attacker obtains an encrypted image and its corresponding decrypted image, the key stream can be estimated without the encryption key, and the encrypted image with the same key is at risk of content leakage

Method used

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  • Encryption-domain reversible information hiding method based on classified scrambling and hiding information classification
  • Encryption-domain reversible information hiding method based on classified scrambling and hiding information classification
  • Encryption-domain reversible information hiding method based on classified scrambling and hiding information classification

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Embodiment

[0059] A specific implementation of the present invention is a method for reversible information hiding in an encrypted domain based on classification scrambling and hierarchical hidden information, including the following steps:

[0060] A, classification scrambling encryption

[0061] A1, block classification matrix:

[0062] The original image X of size (P×M)×(Q×N), X={x i, j |i=1,2,...,I,j=1,2,...,J is divided into M×N non-overlapping image blocks X m, n , X m, n ={x p, q |p=1, 2,..., P, q=1, 2,..., Q};

[0063] Among them, I=P×M is the number of rows of the original image X, J=Q×N is the number of columns of the original image X; m is the image block X m,n The vertical serial number of, the maximum value is M; n is the image block X m,n The horizontal serial number of, the maximum value is N; p is the image block X m,n Pixel x p,q The number of rows, q is the image block X m,n Pixel x p,q The number of columns; P and Q are image blocks X m,n The number of rows and column...

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Abstract

Provided is an encryption-domain reversible information hiding method based on classified scrambling and hiding information classification. Variable pixels and fixed pixels are classified into blocks and scrambled in a classified way to reserve a hidden space of an encryption image; during image encryption, the image is divided into variable pixels and fixed pixels, bitwise XOR and scrambling encryption are carried out by taking the pixel as unit, and pixel values and positions are protected by encryption; at the same time, a block classification matrix serves as a part of an image encryption key, and further the possibility of leakage of content of the encryption image is further reduced; and during information hiding, the information to be hidden is divided into disclosed, authorized and private types according to functions, and protection of different levels is realized by using different encryption methods. During information extraction, the information can be extracted correctly by obtaining corresponding authorization, and the private information is very hard to obtain without a hidden secret key; and during image decryption, the encryption image the same with an original image can be obtained via an encryption key only. An algorithm is easy to realize, and the steganographic capacity is large.

Description

Technical field [0001] The invention relates to a reversible information hiding method in an image encryption domain. Background technique [0002] With the popularization of the Internet and the development of cloud services, on the one hand digital image data is transmitted and stored in the cloud in the form of ciphertext to protect the content of the digital image, on the other hand, the cloud needs to embed hidden information as data in the ciphertext digital image. Management provides convenience. The receiver needs to extract the hidden information in the ciphertext digital image, or decrypt the ciphertext digital image, remove the hidden information, and restore the original image. The embedding and extraction of hidden information in the ciphertext digital image and the lossless restoration of the image are the reversible data hiding in the image encryption domain (RDH-EI: Reversible Data Hiding in Encrypted Image). [0003] In recent years, many methods have been propos...

Claims

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Application Information

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IPC IPC(8): G06T9/00H04N1/32
CPCG06T9/00H04N1/32272
Inventor 陈帆和红杰尹帮旭鄢舒
Owner SOUTHWEST JIAOTONG UNIV
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