A Lightweight Image Encryption Algorithm Based on Chaotic Map and Random Substitution

Abstract

Chaotic-maps-based image encryption methods have been a topic of research interest for a decade. However, most of the proposed methods suffer from slow encryption time or compromise on the security of the encryption to achieve faster encryption. This paper proposes a lightweight, secure, and efficient image encryption algorithm based on logistic map, permutations, and AES S-box. In the proposed algorithm, SHA-2 based on the plaintext image, a pre-shared key, and an initialization vector (IV) are used to generate the initial parameters for the logistic map. The logistic map chaotically generates random numbers, which are then used for the permutations and substitutions. The security, quality, and efficiency of the proposed algorithm are tested and analyzed using a number of metrics, such as correlation coefficient, chi-square, entropy, mean square error, mean absolute error, peak signal-to-noise ratio, maximum deviation, irregular deviation, deviation from uniform histogram, number of pixel change rate, unified average changing intensity, resistance to noise and data loss attacks, homogeneity, contrast, energy, and key space and key sensitivity analysis. Experimental results reveal that the proposed algorithm is up to 15.33× faster compared to other contemporary encryption methods.

Development of playfair cryptosystem based on generation a multi-dimensional key matrix

“…A variety of metrics are used to test and analyse the proposed system's security and efficiency (such as: number of pixel change rate (NPCR), mean square error (MSE), entropy, correlation coefficient) on 784 samples of various multimedia file types and formats. Consequently, a discussion is presented according to the obtained results for further enhancements that could be made to increase the performance of proposed system [1], [4], [9], [14], [15].  ISSN: 2302-9285…”

“…Chaos random sequences are formed via handling iterative equations as shown in (1). Such that, a few minor changes in the initial parameters (r and x) will produce far and wide changes in outcome sequences [2]- [4], [9], [18].…”

“…For more than a decade, image encryption including scrambling-diffusion structures based on chaotic maps has attracted the interest of researchers and professionals since it addresses the slowness of most encryption techniques. Thus, diffusion processes will enhance the robustness of the algorithms and increase its resistance against different attacks [2]- [4], [6]- [10]. Previous related works to the cryptosystem targets for this paper are demonstrated as: according to Arroyo et al [8], a 16×16 dynamic matrix with multidimensional element-in-grid sequencer (MEGS)-based modified playfair technique is proposed including: rotation, shifting, rolling, and crossover matrix operations to be applied for password security or image steganography.…”

“…To reduce the correlation between contiguous pixels, chaotic sequences is used to achieve intra-block permutation. According to Alghamdi et al [4], a secure lightweight image encryption system is implemented based on logistic map and pre-shared SHA-2 key image, which is appropriate for realtime applications and devices. According to Chai [7], the plain image is decomposed into multi-planes of 8 layers, then the encrypted image is obtained after performing in sequence diffusion and scrambling planes operations.…”

“…Figure2. Samples of the full permuted key generated as a multidimensional matrix (a) 2D KeyMatrix of size[16,16], (b) four cascaded 2D KeyMatrix of size[8,8], and (c) 3D KeyMatrix of size[8,8,4] …”