In today's information environment, characterized by the increasing digitalization of various aspects of daily life, information security is of paramount importance. Many types of personal information, including identity, financial and medical records, are digitally stored. Organizations need to protect their intellectual assets, sensitive data and business information from competitors and insider threats. The synergistic approach of combining cryptography and steganography provides increased sophistication in analyzing transmitted data and reduces its vulnerability to attacks based on statistical analysis and other pattern detection techniques. Associative Steganography is a methodology that integrates the basic principles of steganography and cryptography to provide strong data protection. The development of a software application designed for associative file protection can be applied in a wide range of areas and has significant potential in the context of information security. In this article the prerequisites for creating this application are discussed, the program design of the application is described using UML (Unified Modeling Language) and aspects of its implementation are analyzed. In addition, the results of testing the application are investigated and further prospects for the development of associative steganography are proposed.

Keywords: associative steganography, stego messaging, stego resistance, cryptography, information security, Unified Modeling Language, .NET Framework runtime, Windows Presentation Foundation, DeflateStream, BrotliStream, MemoryStream, parallel programming