LoRaWAN 物聯網之低功耗資料加密方法

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Title:	LoRaWAN 物聯網之低功耗資料加密方法
Other Titles:	Low Power Data Encryption Method ForLoRaWAN-based IoT
Authors:	黃郁淩 HUANG, YU-LING
Contributors:	蔡坤霖 TSAI, KUN-LIN 電機工程學系
Keywords:	物聯網;AES加密方法;低功耗 AES-128;LoRaWAN;IoT;Low Power
Date:	2019
Issue Date:	2019-03-21T09:12:25Z (UTC)
Abstract:	近年來，物聯網(Internet of Things, IoT)不只侷限於工業用途，也應用在許多截然不同的領域，例如健康照護與智慧農場。物聯網漸漸的成為熱門的基礎建設，大量的資料收集以供後續的決策依據，科技正逐漸的提升我們的生活環境。LoRaWAN為其中一個用於IoT資料傳輸的低功耗廣域網路協議，由LoRa聯盟提出，低功率且長距離的特色使其備受矚目。LoRaWAN採用Advanced Encryption Standard(AES)加密方法，AES使用代數運算及多重加密循環來確保其通訊安全。 LoRaWAN透過為不同的終端裝置設置相異的傳輸延遲來降低其通訊功率，但是， AES加密終端裝置的功耗並未被考慮到。本論文提出一種高安全性且低功耗的通訊方案，稱為低功耗資料加密方法(Low Power Data Encryption Method，LPDEM) ，旨在透過減少AES的加密循環，降低終端裝置的數據加密功耗。在LPDEM中，定期更新加密金鑰與加入D-Box更新程序以增強安全等級，並簡化AES的加密過程，最終進一步降低功耗但仍具備高安全性。與傳統AES相比，分析結果指出LPDEM可以將加密功率降至26.2%。LPDEM可以有效抵禦三種攻擊，包括已知密鑰，重送和竊聽攻擊，並且適合使用於LoRaWAN的IoT 環境中。 In recent years, Internet of Things (IoT) has been used not only for industria, but alsoin many distinct domains, such as healthcare and smart farming. Internet of Things has gradually become a popular infrastructure. Technology is helping people to do something, aiming to improve our living environments.LoRaWAN, developed by LoRa Alliance, is one of the Low Power Wide Area Network (LPWAN) protocols. Its low-power and long-distance features make it suitable for IoT environments. LoRaWAN adopts Advanced Encryption Standard (AES) for data encryption, which uses algebraic operations and multiple encryption cycles to ensure its communication security. LoRaWAN reduces communication power by setting different transmission latencies for different end-devices. However, AES does not take into account its end device’s encryption power.This research proposes a high-security and low-power communication scheme for LoRaWAN, named Low Power Data Encryption Method (LPDEM), is aimed to reduce the power consumption of end-device’s data encryption by reducing the encryption cycle of AES. In the LPDEM, encryption key and D-Box update procedure is presented to enhance the security level and simplify the AES encryption process so that the power consumption can be further lowered. Ultimately reducing power consumption but still has high security. Comparing with traditional AES, the analysis results show that the LPDEM can minimize the encryption power up to 26.2%. The LPDEM can also effectively resist three attacks, including known-key, replay and eavesdropping attacks, and is practically helpful for use in LoRaWAN-based IoT environments.
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