Abstract
In response to the problems of high complexity and the large amount of operations of existing color image encryption algorithms, a low-complexity, low-operation color image encryption algorithm based on a combination of bit-plane and chaotic systems is proposed that is interrelated with plaintext information. Firstly, three channels of an RGB image are extracted, and the gray value of each pixel channel can be expressed by an eight-bit binary number. The higher- and lower-four bits of the binary gray value of each pixel are exchanged, and the position of each four-bit binary number is scrambled by a logistic chaotic sequence, and all the four-bit binary numbers are converted into hexadecimal numbers to reduce the computational complexity. Next, the position of the transformed image is scrambled by a logistic chaotic sequence. Then, the Chen chaos sequence is used to permute the gray pixel values of the permuted image. Finally, the gray value of the encrypted image is converted into a decimal number to form a single-channel encrypted image, and the three-channel encrypted image is synthesized into an encrypted color image. Through MATLAB simulation experiments, a security analysis of encryption effects in terms of a histogram, correlation, a differential attack, and information entropy is performed. The results show that the algorithm has a better encryption effect and is resistant to differential attacks.
Highlights
WangWith the rapid development of network information technology, the security of in‐formation transmission has become a growing concern
Cessing technology has advantages in the field of image encryption, with its fast speed and high degree of freedom [2]; the random grid (RG) algorithm forms ciphertext by en‐
In order to overcome the shortcomings in the above literature, this paper proposes a color image encryption algorithm based on bit‐plane information, which is associated with plaintext images with high security and low complexity
Summary
WangWith the rapid development of network information technology, the security of in‐formation transmission has become a growing concern. Rier for information transmission, are widely used in various fields such as medical, mili‐. Digital images are characterized by a large amount of information, high redundancy, and strong correlation, making common en‐. Many algorithms concerning image encryption have been proposed; for example, optical information pro‐. Cessing technology has advantages in the field of image encryption, with its fast speed and high degree of freedom [2]; the random grid (RG) algorithm forms ciphertext by en‐. Aware (CS) algorithm encrypts images by sampling and reconstructing them [7]; chaos theory, with characteristics such as ergodicity, randomness, and initial value sensitivity due to chaotic systems with deterministic but unpredictable states of motion, has made the study of chaotic systems for digital image encryption algorithms increasingly popular [8,9,10]. In the process of network information transmission, color images
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