Present research studies the formation of a digital footprint based on the characteristics of computer hardware to identify APCS users. The authors of the article propose to form a digital footprint from significant static and dynamic hardware characteristics. The main elements of the system and their functionality are reviewed, and the characteristic features are noted. In addition to the selection of characteristics based on analysis, selection is carried out based on a computational experiment, which consists in testing the hardware components of a computer using tests of various types. The effective types of tests are determined that can be carried out and provide the desired level of uniqueness of the dynamic hardware performance associated with the stability index. The results of the article, obtained by the authors, could be used in future works, both for improving and generalizing theoretical results, and for practical application in the problem of identifying APCS users.