Abstract
Digital images are the most frequently used signals to convey information in the internet era. The security of these images is the primary concern in rapidly changing networked environments. In this research, we present a novel approach to secure images by integrating a scanning technique, the El-Gamal public key cryptosystem and chaotic systems. In brief, zigzag and spiral scanning are used first to construct a permuted image. Then, the El-Gamal encryption algorithm is exploited to encrypt the permuted image. Finally, Lorenz and Rossler chaotic sequences are utilized to scramble the pixel locations in the confusion and diffusion stages. This last step that mixes two stages can fortify the entire security performance and enlarge the key size. Exhaustive analysis has been carried out on the SIPI (signal and image processing institute) dataset to assess the efficiency and security of the proposed method. Numerical and visual results indicate the capability of the proposed image cryptosystem to protect images against several known attacks. In addition, the comparative analysis results indicate that the proposed approach outperforms the compared approaches in terms of the visual quality and security criteria.
Highlights
Digital images are widely utilized in a wide spectrum of applicable services
The image was encrypted using the El-Gamal cryptography algorithm and diffused by the 3D Lorenz system. Another hybrid approach [18] is proposed by executing the rules and operations of the DNA algorithm and the Henon-Sine chaotic map to secure digital images that were sent throughout the internet
The Unified Average Changing Intensity (UACI) and Number of Pixels Change Rate (NPCR) are extremely large and near their ideal or critical values, which indicates that the difference between plain and decrypted images is more than 99%
Summary
Digital images are widely utilized in a wide spectrum of applicable services. The images are transmitted through public communication channels and the internet [1]. The image was encrypted using the El-Gamal cryptography algorithm and diffused by the 3D Lorenz system Another hybrid approach [18] is proposed by executing the rules and operations of the DNA algorithm and the Henon-Sine chaotic map to secure digital images that were sent throughout the internet. The authors in [29] proposed a novel chaotic sequences generator based on large precision arithmetic This approach is to encrypt digital images by using chaos cryptosystems leads to improve the system security and increases the key space size dramatically. A new image security scheme to encrypt grey and colour images is proposed This scheme is based on using scanning technology, the El-Gamal public key cryptosystem and chaos theory.
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