აბსტრაქტი. This article explores the development of a High-Frequency (HF) encryptor aimed at securing voice communications in the HF band. The encryptor is designed as an intermediary device positioned between the handset and the radio station, ensuring compatibility with existing systems while addressing concerns over data security. Unlike foreign-made radio equipment that may contain backdoors or lack transparency in their cryptographic systems, the HF encryptor employs a domestically developed solution that is fully compliant with information security standards. Its software is built using the AL04.2 block encryption algorithm, implemented in the high-level programming language C++ to ensure robust cryptographic protection. The design emphasizes repairability, timely updates, and certification transparency, meeting both hardware and software requirements for secure communication. Additionally, this development demonstrates significant progress toward eliminating dependence on foreign cryptographic systems by creating a reliable domestic alternative that offers enhanced protection, efficiency, and adaptability for modern HF radio communications.