Abstract
In real time scenarios, the single image encryption schemes are not that efficient when a bunch of color images is to be encrypted. This problem should be addressed due to computational cost incurred by multiple executions of single color-image encryption scheme. The objective of this research work is to provide a new and efficient multiple color images cipher scheme. This cipher is based on chaotic system, circular shift operations and SHA-384 hash codes. First of all, an arbitrary number of RGB images are input. They are combined in a rectangular fashion to get their hash code. Then this big color-image is decomposed into its three basic components, i.e., red, green and blue. To scramble the pixels of these components, they are shifted circularly both the row-wise and column-wise. Further, XOR operation has been performed to realize the effects of diffusion in these components. Lastly, these components are joined together to get the final RGB cipher image. Apart from the 384-hash codes, a salt key of 384-bit has also been used in the proposed cipher to heighten the security effects. The SHA-384 hash codes render the required key space and plaintext sensitivity. The simulation results and the performance analyses carried out at the end clearly prove the efficiency, effectiveness, robustness and the real-world applicability of the proposed multiple RGB images cipher. Besides, the encryption throughput 7.716 Mb/s of the proposed scheme outperforms many of the existing ones.
Highlights
The present era of digital technologies, internet, internet of Things (IoT), Big Data etc. have revolutionized virtually all the cultures of the nations
The pressing demands of this modern world is to encrypt maximum images in the minimum possible time. This concept is formalized through the encryption throughput, and we got this as 7.716 Mb/s
One can see from the results of the validation metrics, i.e., information entropy, noise and data loss attack, differential attack metrics (NPCR, unified average changing intensity (UACI)), correlation coefficient, that they all are very competitive
Summary
The present era of digital technologies, internet, internet of Things (IoT), Big Data etc. have revolutionized virtually all the cultures of the nations. The strict requirements of the modern world dictate to develop such ciphers which may encrypt an arbitrary number of images efficiently. A new MIE scheme using chaotic system and DNA has been proposed in [17] They merged images to a single image followed by scrambling it using chaotic map. The proposed multiple RGB images encryption scheme consists of seven stages. The SHA-384 hash code has been taken of the so formed big color image to introduce the plaintext sensitivity in the proposed scheme. The amount of shifting is decided by the random numbers produced through selection − rotation
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