A Multicriterial Analysis of the Efficiency of Conservative Information Security Systems Publication Type: Journal Article Authors: Valeriy Dudykevych; Ivan Prokopyshyn; Vasyl Chekurin; Ivan Opirskyy; Yuriy Lakh; Taras Kret; Yevheniia Ivanchenko; Ihor Ivanchenko Source: Eastern-European Journal of Enterprise Technologies, Volume 3, Issue 9(99), p.6–13 (2019)