A NOVEL STEGANOGRAPHY METHOD BASED ON 4 DOMINATIONS STANDARD CHAOTIC MAP IN SPATIAL DOMAIN

摘要

The goal of steganography is to embed secret information in a data is considered as a cover in a way that unparticipating users can not able to discover the content of this information by estimating the data. In this paper, new method of stenography has been suggested to hide text in cover image as dynamic method in which combine cryptograph with information hiding to do high level security. In this method chaotic theory is used to choose randomly pixel in image based on initial control parameters. Some operations of number theory are used to generate keys from text's characters with these coordinates of the location of chosen pixel which are used to change these characters from the text which is stored in this location as four dominations to make diffusion and confusion in text and hide in cover image randomly. The result experiments show strongest of this method based on value of Mean Square Errors (MSE), Pack Signal to Noise Ratio (PSNR) when compared with other methods.