Method for Rotating Cryptographic Keys Based on Time Tokens for Radio-Electronic Medical Modules with Limited Resources
Вантажиться...
Файли
Дата
2025
Науковий керівник
Назва журналу
Номер ISSN
Назва тому
Видавець
КПІ ім. Ігоря Сікорського
Анотація
The article presents a new approach to periodic rotation of symmetric cryptographic keys for embedded medical radio-electronic modules with limited resources. The method is based on locally generated time tokens formed using a hardware real-time clock or alternative synchronization mechanisms via Bluetooth Low Energy or internal microcontroller timer. Each device independently calculates a new key using a cryptographic hash function and initial vector, avoiding transmission of service messages over the network. An adaptive tolerance window was introduced to increase resistance to small time shifts. The time token structure is presented in two formats, allowing optimal balance between timestamp accuracy, required memory, and service data capabilities. The method is implemented on STM32 and ESP32 platforms under FreeRTOS through the ''key_rotator'' module. Lightweight Speck and Ascon algorithms were used for sensor data encryption. Experimental studies showed 50% reduction in power consumption compared to traditional schemes, generation delay under 1 ms, and synchronization restoration in over 98% of cases after power outages. The proposed approach combines high security, energy efficiency, and stability for medical modules with limited resources.
Опис
Ключові слова
cryptographic key, time tokens, HMAC, tolerance window, FreeRTOS, STM32L4, ESP32, medical sensors, криптографiчний ключ, часовi токени, вiкно толерантностi, медичнi сенсор
Бібліографічний опис
Rozlomii, I. Method for Rotating Cryptographic Keys Based on Time Tokens for Radio-Electronic Medical Modules with Limited Resources / Rozlomii I., Naumenko S., Trembovetskyi R. // Вісник НТУУ «КПІ». Радіотехніка, радіоапаратобудування : збірник наукових праць. – 2025. – Вип. 102. – С. 58-65. – Бібліогр.: 22 назв.