Image Steganography on Gray and Color Image using DCT Enhancement and RSA with LSB Method

This paper explains a novel scheme for data communication over an unsecure channel. This research presents image steganography on gray and color image using discrete cosine transform (DCT) enhancement and RSA with least significant bit (LSB) technique. Secret data is encrypted and decrypted using RSA. RSA is performed to increase the security. Encryption is performed with a key which makes it difficult to get the covert message even if the presence of the hidden message is exposed. Now the stego image is enhanced using DCT. This implementation is performed on MATLAB and the key power of this scheme is its vast data hiding ability and smallest distortion in enhanced Stego image. It is functional over many pictures and the outcomes show smallest distortion in enhanced stego image. The performance analysis is evaluated on the source of Peak Signal Noise Ratio (PSNR) and entropy.