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Image compression encryption method based on compressed sensing and fractional order chaos

A technology of image compression and compressed sensing, which is applied in the direction of secure communication through chaotic signals, image communication, digital transmission system, etc., and can solve the problems of insufficient security of image compression and encryption schemes

Pending Publication Date: 2021-12-03
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

[0005] Aiming at the problem of insufficient security of the image compression encryption scheme based on low-dimensional integer order chaotic system, the present invention proposes an image compression encryption method based on compressed sensing and fractional order chaos

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  • Image compression encryption method based on compressed sensing and fractional order chaos
  • Image compression encryption method based on compressed sensing and fractional order chaos
  • Image compression encryption method based on compressed sensing and fractional order chaos

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Embodiment Construction

[0078] In order to better understand the technical scheme of the present invention, the following combination Figure 4 Embodiments of the present invention are further described.

[0079] as attached Figure 4 As shown, a kind of image compression encryption algorithm based on fractional order chaotic system described in the present invention, comprises the following steps successively:

[0080] The first step is to calculate the initial values ​​x0, y0 and z0 of the fractional chaotic system through the SHA / MD5 hash value of the original image and the external key K. The 256-bit external key K is used by the communication party (sender and Receiver) is randomly generated and shared through a secure channel, which can be expressed as K={k in 8-digit decimal format 1 ,k 2 ,...,k 32}. Combine the external key K and the hash value H through ⊕, that is, the XOR operation to obtain K’={k’ 1 ,k' 2 ,...,k' 32}. The initial values ​​x0, y0 and z0 of the fractional order chao...

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Abstract

The invention discloses an image compression encryption method based on compressed sensing and fractional order chaos, and belongs to the technical field of multimedia information security. The invention provides an image compression encryption method based on compressed sensing and fractional order chaos to solve the problem that an image compression and encryption scheme based on a low-dimensional integer order chaos system is insufficient in safety. According to the method, a new three-dimensional fractional order chaotic system is constructed to provide a random sequence required by an image compression encryption algorithm, and the complexity and key space of the algorithm are greatly expanded. An image is compressed by adopting a compressed sensing algorithm, and a novel measurement matrix is constructed according to a random sequence. Meanwhile, the scheme follows a classical confusion and diffusion structure, and a Josephus problem principle and annular diffusion are used as image scrambling and diffusion algorithms respectively. Theoretical analysis and experimental results show that the algorithm is high in safety and has wide application prospects and practical value.

Description

technical field [0001] The invention belongs to the technical field of multimedia information security, and in particular relates to an image compression and encryption method based on compressed sensing and fractional chaos. Background technique [0002] With the rapid development of the Internet, the dissemination and storage of information has become more convenient. Due to its vividness, digital images have become one of the important means for people to express information. Image encryption is an effective tool for data security protection, but image data often has high redundancy and strong correlation between pixels. Therefore, image data compression should be considered before transmission, storage, and encryption, so as to increase transmission speed and reduce storage space without affecting image quality. [0003] Many new methods have emerged in the process of image encryption, such as DNA rules, bit-level permutations, and half-tensor product theory. 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
CPCH04N1/32272H04N1/32277H04N1/44H04L9/001
Inventor 佟晓筠魏京锦张淼
Owner HARBIN INST OF TECH AT WEIHAI
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