Digital Image Feedback Encryption Method Based on Image Network

Abstract

The invention discloses a digital image feedback encryption method based on an image network. The method comprises the following steps of processing a digital plaintext image; constructing the image network in which a node is a super-chaotic system and a non-neighbor connection mode is possessed; through three-dimensional Arnold, converting a scrambling image, wherein a scrambling matrix is driven by image-network space-time chaotic display and a current plaintext image; combining feedback information of the current plaintext image and a cryptograph image and carrying out image diffusion processing; alternatively operating scrambling and diffusion multiple times and acquiring the cryptograph image. In an encryption system, a scrambling-diffusion alternative-operated loop iteration structure is designed; during an encryption process, plaintext and cryptograph feedback mechanisms are introduced; and during each encryption, the used scrambling matrix and a secret key flow are dynamically changed and are different. An experiment result shows that the encryption method possesses high safety and high efficiency; and a capability of resisting various plaintext attacks, statistics attacks, violence attacks and difference attacks is high.

Description

technical field [0001] The invention relates to the field of information technology security, in particular to a digital image feedback encryption method based on an image network. Background technique [0002] Today is an information age. Relevant scientific research and statistics show that about 75% of the information that humans obtain from the outside world comes from images. Images transmitted in a network environment are vulnerable to third-party theft, tampering, illegal copying and dissemination. Therefore, the secure transmission and encryption of images has always been concerned by people. [0003] Scrambling and diffusion are the basic principles to realize the security of image encryption algorithm. According to the encryption method, the encryption method can be roughly divided into: the encryption method based on the traditional cryptosystem, the encryption method based on the scrambling transformation, the encryption method based on the chaos theory, etc. ...

AI Technical Summary

Problems solved by technology

In the existing CML-based encryption technology, it has the following characteristics: 1) The CML model is formed by a one-dimensional Logistic map on the grid point and is formed by nearest neighbor coupling, which makes the correlation of the chaotic sequence on adjacent grid points stronger; 2) The key stream is constructed based on the chaotic sequence generated by CML, and the key stream is used to directly diffuse the image to form a ciphertext image. This lack of obfuscation process for the pixel position of the plaintext image makes the statistical characteristics between the plaintext and the ciphertext It is not complicated enough; 3) In the multi-round diffusion operation, the static encryption algorithm is adopted, and the key stream remains unchanged only depending on a chaotic sequence, which makes the encryption algorithm difficult to resist known plaintext attacks and chosen plaintext attacks

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