اشواق عوده كاظم العادلي

Balancing high embedding capacity, imperceptibility, security, and lossless recovery remains a fundamental challenge in image steganography. This paper proposes a crypto-stego scheme that integrates a six-dimensional (6D) hyperchaotic system with spread spectrum modulation to achieve dual-layer protection. Unlike existing methods that either sacrifice embedding capacity for security or require complex frequency-domain transforms, our approach embeds a full secret image directly into a cover image of identical dimensions while preserving nearly perfect reconstruction. The proposed scheme generates four distinct keys from a single chaotic sequence, controlling pixel scrambling, spread spectrum modulation, authentication, and final encryption sequentially. Experimental results on BMP, PNG, JPG, and TIFF images of varying sizes demonstrate that the embedded images maintain excellent imperceptibility (PSNR = 43.37–50.78 dB, SSIM = 0.9911–0.9991). Chaotic encryption converts the stego image into random noise (NPCR = 99.60–99.68%, UACI = 33.38–33.47%, entropy ≈ 7.999). The secret image can be recovered with near-perfect quality (PSNR > 81 dB, SSIM = 1.0, correlation = 1.0), and the entire embedding-extraction process completes in under one second. Comparative analysis shows that our scheme outperforms recent deep learning-based steganography methods (U-Net, U-Net++) in both imperceptibility and recovery quality. The scheme also demonstrates graceful degradation under cropping and additive noise attacks. The proposed system offers a practical, computationally efficient solution for applications requiring simultaneous confidentiality, integrity, and real-time performance.

This paper describes a novel five-dimensional hyper-chaotic system, where the novel system has twelve positive parameters and the basic features and dynamic behav- ior of the chaotic system are tested through the usage of equilibrium points, dissipativity, symmetry, Lyapunov exponents, waveform analysis, Kaplan-Yorke dimension, and sen- sitivity to initial conditions. It has found that the system has two unstable equilibrium points as well as it is a dissipative system, it has symmetric pairs of coexisting attractors, such as limit cycles or strange attractors, it has two non-negative Lyapunov exponents where the maximum non-negative Lyapunov exponent is (0.721821), Kaplan-Yorke di- mension has been calculated as (2.66735), and it can be observed that the waveform of the time range has non-periodic properties. These results confirm that the nonlinear system is actually a hyperactivity system, random, and shows great complexity, as it is highly sensitive to initial conditions and therefore unpredictable for long periods.

This paper advancement a new and active algorithm for the chaotic scheme centered on the Sudoku matrix, where a new five-dimensional chaotic scheme is created to create the random key into encrypting the color picture. The encryption system includes a scrambled image by using the chaotic sequence generated, then perform an XOR operation between the Sudoku Matrix and scramble, and then perform the scrambling process again, and then perform XOR between a chaotic key and the original image after previous processes. The power of the encrypting has been specified by analyzing the histogram, the correlation coefficient, Number of Pixels Change Rate (NPCR), the entropy, Unified Average Changing Intensity (UACI), and Peak Signal into Noise Ratio. Results showed that the characteristics of the proposed system are highly resistant to the various attacks. The time of encryption and decoding is very small.

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برنامج Word 2016 هو برنامج معالجة نصوص متطور متوفر ضمن حزمة أوفيس وهو مخصص لمعالجة الكلمات بحيث يتيح إدخال الكلمات بصيغة إلكترونية ومن ثم معالجتها وإخراجها بالشكل المطلوب حسب حاجة المستخدم، وهو من أهم البرامج التي أنتجتها شركة مايكروسوفت الأمريكية لمعالجة النصوص.