Özet:

The rapid development in the field of communication and technology has led to a heavy increase in the data produced in digital environment, and the need to take various active security measures has arisen in the case of robust secured data and end-to-end transmission. In line with this need, widely used methods developed are Cryptography which scrambles the data to secure the information, and Steganography techniques aiming to conceal data in digital objects so third parties cannot detect the transmitted content. Image steganography techniques can be divided into two groups: spatial domain and transform domain. Spatial domain techniques embed messages directly in the intensity of the pixels, while the transform domains also known as frequency domain images are first transformed and then the message is embedded in the image. Many practices have been offered and developed in the literature to provide secure transmission of the data. In this paper, data-hiding techniques based on frequency domain image steganography has proposed. Among these techniques, the working principle of DFT has been explained, DCT and DWT techniques performed to embed and extract secret data. As a result of the proposed methods, it has been achieved to obtain the maximum data embedding capacity inthe cover image by minimizing the distortion in the stego image. It has been observed that the size and quality of the JPEG stego images have been obtained without deterioration after the data is hidden. The experimental results show successful extraction of the accurate secret message. Some good PSNR of ≈50 dB and SSIM results of the proposed methods can represent successful restoration for the same image.

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