Dr. Addapalli V. N. Krishna Profile

Dr. Addapalli V. N. Krishna

at CHRIST (Deemed to be Univ.)

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SPIE Journal Paper | 9 November 2022

Securing grayscale image using improved Arnold transform and ElGamal encryption

Shiju Thomas, Addapalli Krishna

JEI, Vol. 31, Issue 06, 063012, (November 2022) https://doi.org/10.1117/12.10.1117/1.JEI.31.6.063012

KEYWORDS: Image encryption, Picosecond phenomena, Image processing, Image quality, Visualization, Diffusion, Computer programming, Receivers, Image filtering, Cryptography

Read Abstract +

The security of sensitive data is critical, and it opens up a wide area of research to find efficient and effective methods to prevent unauthorized access. Our study provides a secure framework for sending visual information over an untrusted channel, such as a social networking site. The proposed framework is a combination of scrambling and encryption techniques. Initially, a hybrid block-wise and pixel-wise scrambling approach is administered to the grayscale image, followed by the Arnold transform, which causes all pixel points to move within the image. Finally, to improve the efficiency of the diffusion process, the asymmetric encryption ElGamal algorithm has been mastered. Peak-signal-to-noise ratio (PSNR), structural similarity index metric (SSIM), number of pixels change rate (NPCR), and unified average changing intensity (UACI) are the metrics utilized to evaluate the efficiency of the proposed scheme. The efficiency of the suggested scheme validates the low-average PSNR value of <9 dB and the SSIM average value of <0.01 for the encrypted images. The NPCR and UACI values achieved in our study are above the threshold values of 99.6% and 33.33%, respectively, exhibiting the strength of the proposed framework.

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