saucis

Sakarya University Journal of Computer and Information Sciences

2636-8129

Sakarya University

10.35377/saucis...1749483

Computer Software

Bilgisayar Yazılımı

A New Hybrid Image Encryption Model Based on Custom Logic Functions and Dynamic Chaotic Keys

https://orcid.org/0000-0003-3379-0603

Khalil

Adil

Diyala

https://orcid.org/0009-0004-0979-8781

Al Imam

Adel

University of Diyal

12 29 2025

8 4 762 772 07 23 2025 10 27 2025

2018

Sakarya University Journal of Computer and Information Sciences

Any secure image encryption system needs to distort the statistical and visual structure of the image to prevent unauthorized access. Unlike traditional chaos-XOR methods, this paper presents a new hybrid image encryption model based on dynamic chaotic key generation, combined with two novel dedicated bit-level logic functions. The proposed model includes image pre-processing steps, such as flattening color channels and pixel shuffling, to break down the spatial structure. Bit-level nonlinear transformations are then applied using dedicated bit-level logic functions (FLF and FOF). The Bogdanov scheme was used as the chaotic key generator. The image encryption quality was evaluated against four state-of-the-art models using Entropy, NPCR, UACI, PSNR, and SSIM, along with visual analysis of histograms and correlation indices. The experimental results reported an average Entropy value of 7.95. NPCR rate and UACI values were 99.61% and 33.2% respectively. The correlation coefficient was 0.0046. The SSIM remained at 1.0, while the average encryption execution was 0.47 seconds. These results demonstrate that the proposed system can achieve a high level of visual security. This study represents a qualitative and quantitative contribution to the development of secure digital image processing methods.

Image Processing Bogdanov Scheme FLF FOF Chaotic Key

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