Secure communication is a critical requirement in military and security operations, particularly in remote and infrastructure-less environments. Conventional solutions such as satellite phones, GSM networks, and radio communication require significant infrastructure, incur high costs, and often consume substantial power, limiting field usability. This paper presents the design and development of a fully functional secure communication system using LoRa technology for remote messaging. The system provides long-range, low-power, and infrastructure-independent communication, making it suitable for deployment in challenging terrains. End-to-end encryption has been implemented to ensure confidentiality and integrity of transmitted messages. A working prototype was developed that integrates message input, encryption, LoRa-based transmission and reception, and message decryption with output display. The system was tested under multiple conditions, including open-area and indoor environments, and demonstrated reliable and error-free message delivery. Additionally, a basic mobile application was developed to enable user-friendly message exchange. The proposed solution offers a cost-effective, portable, and secure communication platform that can be deployed for military and security operations, ensuring mission-critical data remains protected even in the absence of network infrastructure.
Gupta et al. (Wed,) studied this question.