Undetectable spread-time stegosystem based on noisy channels

We consider a scenario where an attacker is able to receive a stegosignal only over a Gaussian channel. But in order to provide security of this channel noise-based stegosystem under the very strong condition that an attacker may know even the cover message, it is necessary to establish a very low signal-to-noise ratio in the channel. The last requirement is very hard to be implemented in practice. Therefore we propose to use spread-time stegosystem (STS). We show that both security and reliability of such STS can be guaranteed and their parameters can be optimized with the use of error correcting codes. We show some simulation results with an own STS implementation for digital audio cover messages presented in WAV format.