A ROBUST AND IMPERCEPTIBLE FOR DIGITAL IMAGE ENCRYPTION USING CHACHA20

Widhi Bagus Nugroho; Ajib Susanto; Christy Atika Sari; Eko Hari Rachmawanto; Mohamed Doheir

doi:10.52436/1.jutif.2024.5.2.1470

Widhi Bagus Nugroho Informatics Engineering, University Dian Nuswantoro, Indonesia
Ajib Susanto Informatics Engineering, University Dian Nuswantoro, Indonesia
Christy Atika Sari Informatics Engineering, University Dian Nuswantoro, Indonesia
Eko Hari Rachmawanto Informatics Engineering, University Dian Nuswantoro, Indonesia
Mohamed Doheir Universiti Teknikal Malaysia Melaka, Malaysia

DOI: https://doi.org/10.52436/1.jutif.2024.5.2.1470

Keywords: Cryptography, Chacha20, MSE, NPCR, PSNR, UACI

Abstract

In the current era, data security is mandatory because it protects our personal data from being used by irresponsible people. The objective of this research is to show the robustness of the method we propose to encrypt images using the chacha20 algorithm which is included in the symmetric encryption cryptography technique and uses one key for both encryption and decryption processes. we use the encryption method by reading the bits from a digital image which is processed using the chacha20 algorithm to get the results of the digital image encryption. The results of this study indicate that the Chacha20 algorithm is secure to use when encrypting and decrypting digital images. The average MSE value generated by the chacha20 algorithm is 0.1232. The average PSNR value is 57.4784. The average value of UACI is 49.99%. The average value of NPCR is 99.602%. The test values were acquired by executing encryption and decryption processes on 5 distinct colour digital images with different size. Additionally, this study displays histograms for the original digital image, as well as for the encrypted and decrypted digital images, illustrating the pixel distribution in each. The histogram also serves as material for analysis of the success of the encryption and decryption processes in digital images.

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