Abstract
Most digital signature algorithms have the ability to organize hidden channels for transmitting information. Their presence was revealed after the publication of a digital signature scheme based on the El-Gamal cipher. The bandwidth of these channels ranges from a few bits (narrowband channels) to 256-512 bits (broadband channels). The literature describes several ways to eliminate broadband channels with the help of a supervisor. The analysis of existing methods of elimination of hidden channels in digital signature algorithms is given. The shortcomings of the existing schemes are revealed. A method of modification of the Russian standard of electronic digital signature GOST R 34.10-2012 has been developed in order to eliminate the broadband hidden channel. The method provides for the presence of a supervisor who does not participate in the formation of the signature and can check signed messages for the absence of hidden channels.
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