TY CONF TI STUDY OF ELECTRONIC SIGNATURE DOCUMENT STANDARDS IN BROWSER: ANALYSIS OF INTERACTION BETWEEN CRYPTOPRO SOFTWARE AND WEB APPLICATIONS OF INFORMATION SYSTEMS KW CryptoPro KW web applications KW digital signature KW GOST KW CSP KW electronic signature in browser KW cryptographic integration JO PROBLEMS AND PROSPECTS IN SYSTEMS AND PROCESS MODELING AU Pustovalov, A.A. AU Zarevich, A.I. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov