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Single-round image encryption method based on hybrid chaotic mapping

A technology of chaotic mapping and encryption method, which is applied to secure communication through chaotic signals, digital transmission systems, electrical components, etc., and can solve the problems of choosing plaintext attacks, increasing computational complexity and time overhead, and insufficient dynamic characteristics.

Active Publication Date: 2020-09-18
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004]Although the evolution of encryption methods has brought certain efficiency and security improvements, there are still some problems to be solved: (1) Chaotic systems, whether continuous chaotic systems It is still a discrete chaotic system, the dynamic characteristics of the system are not rich enough, and the randomness of the generated sequence needs to be further improved; (2) In the scrambling stage, the generated scrambled chaotic sequence has no strong correlation with the plaintext, and is vulnerable to chosen plaintext attack ; (3) Different chaotic sequences are used in the scrambling stage and the diffusion stage, which increases the computational complexity and time overhead

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  • Single-round image encryption method based on hybrid chaotic mapping
  • Single-round image encryption method based on hybrid chaotic mapping
  • Single-round image encryption method based on hybrid chaotic mapping

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Embodiment Construction

[0009] The invention is a single-round image encryption method based on mixed chaotic mapping, which comprises the following steps: one-dimensional and two-dimensional mixed chaotic mapping, an image encryption step and an image decryption step.

[0010] The above-mentioned single-round image encryption method based on mixed chaotic map, one-dimensional two-dimensional mixed chaotic map, its formula is:

[0011]

[0012] where α, β, γ 1 , gamma 2 For the four parameters of this mapping, the value range is α ∈ [0, 6], β ∈ [0, 6], γ 1 ∈[0,2],γ 2 [0, 2].

[0013] The above-mentioned single-round image encryption method based on hybrid chaotic map, the image encryption step described,

[0014] Input: a plaintext image P of size M*N, the initial value K=α, β, γ calculated according to the plaintext image 1 , gamma 2 , x 0 ,y 0};

[0015] Output: encrypted image C;

[0016] Step (1): Input initial value K into MOTDCM mapping for M*N+N 0 iterations, where N 0 is a cons...

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Abstract

The invention discloses a single-round image encryption method based on hybrid chaotic mapping. The method comprises the steps of one-dimensional and two-dimensional hybrid chaotic mapping, image encryption and image decryption. The invention provides a mixed one and two dimensional chaotic map (MOTDCM) based on the mixing of one-dimensional chaotic mapping and two-dimensional chaotic mapping, a random and uniformly distributed chaotic sequences can be provided, a full-text dynamic correlation encryption method is designed based on the hyperchaotic system, scrambling and diffusion processes are combined, the calculation complexity and time overhead of a conventional encryption method are reduced, and the capability of the method for resisting selected plaintext attacks is enhanced.

Description

technical field [0001] The invention relates to the technical field of digital image encryption. Background technique [0002] With the rapid development of computer network technology, many private image information such as medical images, military satellite images, etc. are transmitted on the public network. Therefore, the security of image information has aroused great concern. However, traditional encryption methods such as DES and RSA are no longer suitable for encrypting image information, mainly because image information has the characteristics of large data volume, high redundancy, and strong correlation between pixels compared with text information. Therefore, an effective image encryption method should be able to prevent the image from being stolen and decrypted by attackers during transmission and storage. In recent decades, chaotic systems have been widely used in digital image encryption due to their random-like properties and ergodicity. [0003] In 1998, J....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00
CPCH04L9/001
Inventor 贵向泉黄俊李立曹洁赵付青唐建新李守亮张永虎
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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