The method of spectral analysis of the determination of random digital signals. - Oleksandr Laptiev; Volodymyr Tkachev; Oleksii Maystrov; Oleksandr Krasikov; Pavlo Open'ko; Volodimir Khoroshko; Lubomir Parkhuts (Int. J. Commun. Networks Inf. Secur., 2022)