分散式阻斷服務攻擊通常發生在雲端，而且只要一發生攻擊，就會造成很嚴重的癱瘓問題。然而，隨著物聯網裝置數量逐漸增加，從物聯網裝置發起的大規模分散式阻斷服務攻擊，對網路所造成的影響已經不容被忽視。所以，在此篇論文，我們提出一個多層物聯網分散式阻斷服務攻擊偵測系統，其中包含物聯網裝置、物聯網閘道器、軟體定義網路交換機、雲端伺服器四層。我們提出對於物聯網裝置傳輸協定的安全認證，並透過機器學習偵測分散式阻斷服務攻擊。在校園中，實際佈署了八盞智慧路燈與多種類型的感測器作為我們的實驗環境。蒐集所有從路燈來的封包作為我們訓練資料集，其中分為從路燈蒐集來的感測資料與行人透過無線網路上網的網路資料。我們根據不同的攻擊類型，對訓練特徵進行提取。實驗結果顯示：在真實的物聯網環境中，我們的分散式阻斷服務攻擊偵測系統能達到高於98% 的準確率。根據機器學習偵測出來的惡意攻擊裝置會被列入黑名單中，並由軟體定義網路控制器對黑名單內裝置進行阻擋。

DDoS attacks often happen in cloud servers and cause a devastating problem. However, an increasing number of Internet of Things devices makes us not ignore the influence of large-scale DDoS attacks from IoT devices. In this paper, we proposed a multi-layer IoT DDoS attack detection system, including IoT devices, IoT gateways, SDN switches, and cloud servers. We propose our IoT security certification for protocols and detect system of DDoS attacks based on machine learning. We implement eight smart poles with various sensors in our campus and collect packets as our datasets that are sensor data from smart poles through wireless network or wired network and network data from pedestrians via Wi-Fi. We extract the features based on DDoS attack types. The feature selection can result in high accuracy DDoS attack detection in the real IoT environment. The experimental results show that our multi-layer DDoS detection system can detect DDoS attacks accurately. Then the SDN controller can block venomous devices effectively according to blacklists from the results of our machine learning detection system.

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