배터리 소모 공격에 대응하는 저전력 웨이크업 리시버의 적응형 파워 세이빙 메커니즘
Adaptive Power Saving Mechanism of Low Power Wake-up Receivers against Battery Draining Attack
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초록
최근 사물인터넷(Internet of Things, IoT)이 인간의 안전, 생명, 자산과 직결되는 산업과 일상생활에 널리 활용되고 있다. 그러나 저가, 경량, 저전력 요건을 충족해야 하는 IoT 장치는 배터리 소모 공격과 간섭 때문에 배터리 라이프타임이 심각하게 단축되는 문제가 있다. 이러한 문제를 해결하기 위해 웨이크업 리시버(Wake-up Receiver, WuR)를 위한 802.11ba 표준이 등장했고, 이 기능은 와이파이 기반 IoT의 에너지 소비를 최소화하는 데 중요한 역할을 하고 있다. 그러나 WuR 프로토콜은 지연시간과 오버헤드를 단축하기 위해서 보안 메커니즘을 고려하지 않았다. 따라서 본 연구에서는 배터리 소모 공격에 대응하기 위해서 저전력 웨이크업 리시버를 위한 적응형 파워 세이빙 메커니즘(Adaptive Power Saving Mechanism, APSM)을 제안한다. APSM은 공격이 잦은 환경에서 파워 세이빙 시간을 기하급수적으로 증가시킴으로써 비정상적으로 발생하는 파워 소모량을 최소화할 수 있다. 실험 결과에 따르면, APSM은 전체 트래픽 중 공격 비중이 10% 이상일 때 종래의 파워 세이빙 메커니즘(Legacy Power Saving Mechanism, LPSM)보다 13.77% 이상의 에너지 소비 효율을 개선할 수 있었다.
Abstract
Recently, the Internet of Things (IoT) has been widely used in industries and daily life that directly affect human safety, life, and assets. However, IoT devices, which need to meet low-cost, lightweight, and low-power requirements, face a significant problem of shortened battery lifetime due to battery draining attacks and interference. To solve this problem, the 802.11ba standard for the Wake-up Receiver (WuR) has emerged, this feature is playing a crucial role in minimizing energy consumption. However, the WuR protocol did not consider security mechanisms in order to reduce latency and overhead. Therefore, in this study, an Adaptive Power Saving Mechanism (APSM) is proposed for low-power WuR to counter battery draining attacks. APSM can minimize abnormally occurring power consumption by exponentially increasing power-saving time in environments prone to attacks. According to experimental results, the proposed APSM improved energy consumption efficiency by a minimum of 13.77% compared to the traditional Legacy Power Saving Mechanism (LPSM) when attack traffic ratio is 10% or more of the total traffic.
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