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Multi-image encryption method based on hyperchaotic Chen system

An encryption method and hyper-chaotic technology, which is applied in the field of multi-image encryption based on the hyper-chaotic Chen system, can solve the problems of being unable to resist plaintext attacks, encrypted images are independent of each other, and system security is not high, and achieve good application scenarios and strong correlation , the effect of a large key space

Inactive Publication Date: 2019-04-12
CHONGQING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

[0005] In view of the existing chaotic image encryption algorithms, there are problems such as low system security, inability to resist plaintext attacks, encrypted images are independent of each other, and low efficiency. A multi-image encryption method based on hyperchaotic Chen system is proposed.

Method used

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  • Multi-image encryption method based on hyperchaotic Chen system
  • Multi-image encryption method based on hyperchaotic Chen system
  • Multi-image encryption method based on hyperchaotic Chen system

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Embodiment Construction

[0020] figure 1 The implementation block diagram of the image encryption algorithm based on the hyperchaotic Chen system. The encryption scheme mainly includes five parts: preprocessing, plaintext-independent depth diffusion, plaintext-associated pixel scrambling, plaintext-independent fast diffusion, and adaptive association bit operation.

[0021] The experiment of the present invention is realized on the MATLAB platform, selects two pictures of M * N pixel size. The specific operation includes the following steps:

[0022] Step 101: Use the SHA256 function to calculate the plaintext image to obtain a set of 256-bit hash value K', with 8 bits as a bit block k i , then K' can be expressed as:

[0023] K'=k 1 ,k 2 ,…k 32 (2)

[0024] Let the input plaintext image be denoted as P i , the size is M×N, and the system key consists of the initial value of the hyperchaotic system and three 8-bit blocks, such as formula (3).

[0025]

[0026] In order to eliminate the adv...

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Abstract

The invention relates to a multi-image encryption method based on a hyperchaotic Chen system. The method aims at the problems that in an existing chaotic image encryption algorithm, system security isnot high, a plaintext attack cannot be resisted, encryption images are mutually independent, and efficiency is low. A hyperchaotic system generates a chaotic stochastic matrix related to plaintext images according to the plaintext images. Plaintext irrelevant deep diffusion is carried out on the plaintext images. One of the images is selected, plaintext related scrambling operation and plaintextirrelevant rapid bit diffusion are carried out on the image, and a first ciphertext is generated. Adaptive relation bit operation is carried out on the rest images, the rest ciphertexts are generated,and multi-image related image encryption is finished. An experiment simulation result shows that the algorithm has relatively high efficiency and relatively high plaintext attack resistance. The plaintext image corresponding to a ciphertext cannot be obtained through utilization of only one ciphertext, so security is relatively high. The algorithm has a good application scene.

Description

technical field [0001] The invention relates to the field of image encryption, in particular to a multi-image encryption method based on a hyperchaotic Chen system. Background technique [0002] With the rapid development and large-scale application of network and multimedia technology, the way people convey information is increasingly dependent on digital multimedia. Digital images are widely used by people because of their inherent advantages of vivid images, rich information and easy understanding. For example, important information such as mobile phone photos in our lives, electronic snapshots of online transactions, and images of medical examinations are closely related to us; military digital snapshots such as satellite images are even more related to national information security, and these image data urgently need to be found. A way of safe and efficient transmission and storage, and encrypting digital images is one of the effective ways to ensure privacy. Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32H04N1/44H04L9/00
Inventor 鲜永菊谢世杰扶坤荣
Owner CHONGQING UNIV OF POSTS & TELECOMM
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