In the work are researched problems, which arise during hiding of messages in text environments, being transmitted by electronic communication channels and the Internet. The analysis of selection of places in text environment (TE), which can be replaced by word from the message is performed. Selection and replacement of words in the text environment is implemented basing on semantic analysis of text fragment, consisting of the inserted word, and its environment in TE. For implementation of such analysis is used concept of semantic parameters of words coordination and semantic value of separate word. Are used well-known methods of determination of values of these parameters. This allows moving from quality level to quantitative level analysis of text fragments semantics during their modification by word substitution. Invisibility of embedded messages is ensured by providing preset values of the semantic cooperation parameter deviations.

The work analyzes the tasks of solving problems, which consist in determining the events that may occur through some time after the completion of the process of solving the problem. One of the possible classifications of such tasks is proposed. The analysis of differences between different types of tasks is carried out, features of implementing the processes of their resolution are revealed. The paper considers in detail such types of tasks as prognosis and prediction. Differences are described between these processes with each other and the characteristics that determine each of the processes. The comparison of various types of processes in the overall forecasting process is presented.

It is difficult to avoid influence of human factor on work of complex technical objects, so safety systems of technical objects have to contain tools of analysis and withstanding possible negative influences from the side of service personnel (SP). To withstand negative influence of human factors on work of a complex technical object, this paper proposes to use steganographic methods of hiding certain information. For that, information is hidden from some members of service personnel (SP), for which the corresponding information is negative. Besides, certain information is hidden from some SP members that can block its transfer in the system of controlling the management process. Methods of implementing the steganographic data concealment are to a great degree dependent on the type of a digital environment that is considered to be used. Introducing the information fragments in a graphic digital environment is performed so that they would be invisible in this environment. Thus, it is necessary for values of parameters that characterize the invisibility degree to be consistent with parameters used to describe the environment itself.

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