Image in image steganography based on DCT

الملخص EN

The secure data transmission over internet is achieved using steganography.

It is the art and science of concealing information in unremarkable cover media so as not to arouse an observer's suspicion.

In this research the proposed system is designed to hide image in image by using discrete cosine transformation method (DCT) and discrete wavelet transformation method (DWT) and Least Significant Bit (LSB).

The system will embed the (input) secret image color inside a cover image color the secret image apply it discrete cosine transformation method (DCT) and the cover image is decomposing into four parts (LL, LH, HL, HH) by using discrete wavelet transformation method (DWT) and the secret image hidden in the part (HH) in segment Least Significant Bit (LSB) of cover image.

And produce (output) stegoimage.

And uses the stego key for extraction the data hidden (secret image) from stego cover through use the process embedding inverse.

The PSNR and MSE value is calculated so that the quality of the image before and after the data hiding is evaluated.

We implement our proposed system using MATLAB ver.

7.6.