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Video image encryption method based on cascade chaotic technology

A technology of video image and encryption method, which is applied to secure communication, image communication, and key distribution through chaotic signals, can solve the problems of small Lyapunov exponent, low initial value sensitivity, and small key space, so as to increase the key size. Space and pseudo-randomness, the effect of enhancing deciphering and difficulty, and improving security

Active Publication Date: 2021-03-16
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of image encryption method based on cascading chaos mapping technology for the deficiency of existing chaotic encryption method, to solve the traditional chaotic encryption method Lyapunov exponent is small, cause the system to initial value sensitivity is not high; The mapping interval is small, resulting in small key space and reduced sequence security.

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  • Video image encryption method based on cascade chaotic technology
  • Video image encryption method based on cascade chaotic technology
  • Video image encryption method based on cascade chaotic technology

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] Such as figure 1 As shown, by calling the camera to collect video images or reading video files directly from the computer disk, and then obtaining the image sequence of each frame, and then encrypting the original image through operations such as decomposition, scrambling, and diffusion, to obtain the final ciphertext Video image, the inverse inverse transformation can be used to decrypt it.

[0036] Such as figure 2 image 3 As shown, when a=10, b=0.9, the bifurcation diagram and Lyapunov exponent spectrum of the L-S cascaded chaotic system;

[0037] The main dynamic characteristics of the system can be analyzed through its Lyapunov exponent and bifurcation diagram. A positive Lyapunov exponent indicates that the motion orbit is locally unstable, and the separation speed is fast on adjacent orbits, but it is stable overall, and repeated motion will form ch...

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Abstract

The invention relates to a video image encryption method based on a cascade chaotic technology. The method comprises a construction encryption process and a decryption process of a key space, and comprises the following steps of: firstly, constructing a cascade chaotic mapping, and generating the key space required by encryption and decryption by using the mapping; then, directly reading an existing video file in a computer disk, or calling a camera to acquire a video image, obtain an image sequence of each frame, compress an original image of each frame to obtain data information of the images, and performing encryption and decryption to obtain color images and R, G and B components before and after encryption and decryption; and therefore, the video data stream before and after final encryption and decryption can be obtained. The method has good practicability for video image encryption, and the problem that an existing chaotic encryption method is small in Lyapunov index, so that the sensitivity of a system to an initial value is not high is solved; and the chaotic mapping interval is small, so that the key space is small, and the sequence security is low.

Description

technical field [0001] The invention belongs to the technical field of file encryption and relates to a video image encryption method based on cascading chaos technology, which is used to solve the problem of low security of the traditional chaos encryption method. Background technique [0002] With the development of Internet technology, the application of digital image, video and audio is becoming more and more extensive. The information carried by images, audio and video covers all aspects of life, ranging from defense technology to basic necessities. The corresponding requirements for safety are becoming more and more urgent. However, traditional encryption algorithms are low in security, low in efficiency, and easy to crack, which can no longer meet the growing needs of information security. The new encryption algorithm should meet the requirements of high security and strong anti-cracking ability. In recent years, the research on chaos has been applied in many fields...

Claims

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Application Information

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IPC IPC(8): H04N21/4408H04N21/4405H04L9/00H04L9/08G06F21/60G06F21/62
CPCH04N21/4408H04N21/4405H04L9/001H04L9/0861H04L9/0869G06F21/602G06F21/6209
Inventor 袁方金元李玉霞
Owner SHANDONG UNIV OF SCI & TECH
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