Satellite Image Encryption Based on AES and Discretised Chaotic Maps
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atellite Image Encryption Based on AES and Discretised Chaotic Maps E. Bensikaddoura, * and Y. Bentoutoua, ** a
Satellite Development Center, POS 50 Ilot T12, Bir-El Djir, Oran, Algeria *e-mail: [email protected] **e-mail: [email protected]
Received October 21, 2019; revised February 8, 2020; accepted February 11, 2020
Abstract—Satellite images have key features such as; large data size, strong correlation between adjacent pixels and high redundancy. Unfortunately, traditional operation modes used to implement the Advanced Encryption Standard (AES) encrypt data without taking into account these specific image features. As a result, the traditional modes are not suitable for image encryption. In this paper, we present a robust satellite image encryption scheme based on discretized chaotic maps and AES. The discretized chaotic maps are used to achieve a confusion and key generation in order to improve the performance of security, especially the sensitivity to plain image. The simulation results show that the proposed technique presents attractive features, including a high level of security, large key space with improved sensitivities to key and plain image. Keywords: Advanced encryption standard, image encryption, discretized chaotic maps DOI: 10.3103/S014641162005003X
1. INTRODUCTION According to the recommendations published by the Consultative Committee for Space Data Systems (CCSDS), the use of data encryption techniques to secure the data transmission from satellites to ground becomes a necessity for civilian mission [1]. Traditional encryption methods such as Data Encryption Standard (DES), RSA and AES are specially designated for text data and not for multimedia data [2]. In addition, several studies have suggested that traditional encryption methods, including AES, are not adequate platforms for encrypting images [3]. Other researchers have proposed modifications in order to adapt AES for image encryption [4–6]. Over the past two decades, varieties of schemes for image encryption have been proposed [4, 5, 7–17]. The typical structure of these image ciphers is composed of two processes that work separately: confusion and diffusion. The first process swaps the pixels of a plain image while the second alternates the value of each pixel. In this paper, a new technique is proposed for the encryption of satellite images. The Standard map and the Discrete Skew Tent map are used to mix pixel positions and for key generation, respectively. This contribution is basically inspired from the following two works: • The work of Fahad T. [5] who proposed an image encryption scheme based on Cat map for confusion and the AES for diffusion. • The contribution of Wong et al. [15] who suggested introducing a certain diffusion effect in the confusion phase by a simple operation on pixel values. The simulation results show that the proposed technique has many attractive features, such as high security level, large enough key space, and good sensitivity to the plaintext message. The paper is organized as follows. Section 2
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