Selection of key in two-component steganography systems with mutual component noising

In general, any steganography system uses two signals - a hidden signal and a container signal. The process of signal recovery requires the receiving party to know the signal from the container. If we represent the transmitted signal as two components, each of which is a function of two signals, then the process of recovering the hidden signal does not require the receiver to know the signal from the container. This article discusses the system in which both signals are informational, and in each component, the two signals are mixed in accordance with a specific algorithm. An important task of designing a steganographic system is the selection of a key. The main requirement for the key is to ensure consistently high sensitivity of the system to the key variation, and, accordingly, to the minimum change of this sensitivity during the formation of the container. The article provides an analysis of a two - component steganographic system from the point of view of sensitivity to variations of various parameters and values of the embedded signals. The conclusions are made about the obtained result.