Design and Implementation of Transformation and Non-Chaotic Substitution Based Image Cryptosystem
Prajwalasimha S N1, Basavaraj L2

1Prajwalasimha S N, Department of Electronics & Communication Engineering, ATME Research Centre, Mysuru, India.
2Basavaraj L, Department of Electronics & Communication Engineering, ATME Research Centre, Mysuru, India.
Manuscript received on July 20, 2019. | Revised Manuscript received on August 10, 2019. | Manuscript published on August 30, 2019. | PP: 1079-1083 | Volume-8 Issue-6, August 2019. | Retrieval Number: F8318088619/2019©BEIESP | DOI: 10.35940/ijeat.F8318.088619
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: In this article, a Modified Pseudo Hadamard Transformation (MPHT) and non-Chaotic substitution based image encryption scheme has been proposed. Due to intrinsic properties such as, strong redundancy and correlation between the adjacent pixels, images are more vulnerable to cyber-attacks. In the proposed technique, the redundancy and correlation have been effectively reduced by pixel position transformation using MPHT and pixel value variation using non chaotic substitution, providing two stage security in encryption for secrete images. An average 99.6089% of Number of Pixel Changing Rate (NPCR) and 33.4328% of Unified Average pixel Changing Intensity (UACI) are obtained for a set of standard test images compared to more popular existing techniques.
Keywords: Redundancy, Correlation, Transformation, Substitution, Encryption.