The steganographic method with multiple access based on frequency-spatial matrices
A.V. Sokolov · INFORMATICS AND MATHEMATICAL METHODS IN SIMULATION · 2022
The solution to some practical tasks with the help of steganography requires the organization of multiple access to a steganographic information transmission channel.At the same time, existing developments imply the use of MC-CDMA technology to solve these tasks, which has a strictly predetermined number of shared channels, requires the simultaneous embedding of additional information delivered from all users and is disintegrated with the applied steganographic algorithm.In this paper, a full-fledged steganographic method, with multiple access based on the use of frequency-spatial matrices has been developed.In the developed method, two code attributes are allocated to each user: frequency and spatial, on the basis of which codewords that are used to transmit information are generated.The total number of registered users operating in the system based on the proposed steganographic method can reach the value of J=4800, while the total number of users simultaneously transmitting information can reach the value of N=100 while supporting the practically acceptable system parameters.At the same time, the embedding of additional information by the users occurs independently of each other at any time convenient to them.To ensure the largest number of simultaneously operating users and minimize the level of intra-system interference, an S-code of spatial arrangements, as well as an F-code of frequency arrangements based on the Reed-Solomon code, are proposed.The proposed steganographic method with multiple access is characterized by flexibility in the allocation of resources of the steganographic channel: if necessary, the throughput of the steganographic channel can be increased with a decrease in PSNR values, or, conversely, the reliability of perception of the steganographic message can be increased by reducing the number of users simultaneously operating in the system.