DIGITAL IMAGE STEGANOGRAPHY SCHEME BASED ON SK-LSB SUBSTITUTION AND THREE PARAMETERS ENCRYPTION METHOD

摘要

Recently, steganography has played an important part in the field of communication, especially in image steganography. The major points of image steganography are the image quality (imperceptibility) of the stego image and the security of the system towards stopping the recoverability of the secret data. Several digital image steganography methods has been introduced, all are focused based payload and image quality. Moreover, there is a trade-off amidst these two metrics and saving a better balance amidst them is yet a challenging case. Therefore, previous methods fail to realize a high security level because to direct embedding secret information inside image without cryptography consideration, making information extraction relatively simple for adversaries. So, a new steganography scheme based on two control random parameters and new encryption method based on three parameters can address the security challenge while new stego key-LSB substitution, SK-LSB can ensure the imperceptibility of the stego image. The objectives of paper to increase the security and PSNR of the stego image. The Hyper technique has been used to compress the secret information prior to embedding, this will also ensure an increase in the payload capacity. The proposed scheme takes effect after compressing and encrypting the secret information. This algorithm is provide different layers of security worked together to augment protection from attacks. The experimental results shows the efficient scheme from PSNR, SSIM and payload for evaluating the stego image compared to the existing methods.