ISSUES OF SSH CONNECTION PROTECTION BASED ON GOST ENCRYPTION IN ALT OS

The paper examines ways to improve the security of remote administration by using Russian cryptographic algorithms when establishing SSH connections in the ALT Linux operating system. The relevance of the study is determined by the need to comply with national information security requirements and to reduce dependence on foreign cryptographic solutions. The research problem consists in assessing the stability of SSH connections based on GOST algorithms and in analyzing how the selected cryptographic policy affects unauthorized access attempts and connection performance. The object of the study is the process of establishing and maintaining an SSH connection, while the subject is the server behavior when the cryptographic algorithm sets of the client and the server do not match. To solve the problem, an experimental SSH server and client configuration was performed in ALT Linux using gostcrypto packages that implement the Grasshopper and Magma algorithms and Stribog-based integrity control functions. The methodology included modeling legitimate and illegitimate connection attempts, analyzing network traffic with Wireshark, and measuring bandwidth and resource load. The experiments showed that a server configured to use only GOST algorithms effectively blocks connections with incompatible cryptographic parameters. When the client is configured correctly, the session is established stably and follows the specified security policy. The performance measurements demonstrate that GOST encryption provides throughput comparable to standard OpenSSH algorithms with a similar computational load. The results confirm the practical applicability of GOST-based SSH encryption for secure administration in domestic operating systems.