Steganography Based on the Hadamard Transform and Modification of the DEMD

In the modern world, the problem of copyright protection by watermarks and trade preserving secrets is very acute. There is a large number of steganography methods that allow us to solve this problem. The most resistant to statistical attacks are the methods that operate with the frequency domain of the container, but small container distortions lead to an error in the lower bits of the reverse transform. The article presents a method included in the class of the frequency domain methods that embed information into the frequency domain of the cover image. To improve the resistance to transformation errors, noise and compression, we proposed the modification of the DEMD embedding method. For the frequency transformation we used the Hadamard transform, because this transform is orthogonal and operates with integers which results in a smaller error in the reverse transform. Embedding occurs in the high-middle frequency of the container. Based on the results of the audit, the proposed solution proved to be more resistant to errors and preserved information to a greater extent.