叢集式無線感測網路之遠程證實協定研究;Remote Attestation for Cluster-based Wireless Sensor Networks

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题名:	叢集式無線感測網路之遠程證實協定研究;Remote Attestation for Cluster-based Wireless Sensor Networks
作者:	石家維;Shih,Chia-Wei
贡献者:	資訊工程學系
关键词:	無線感測網路;遠程證實;Wireless sensor network;Remote attestation
日期:	2014-11-24
上传时间:	2015-03-16 15:57:39 (UTC+8)
出版者:	國立中央大學
摘要:	由於感測終端元件大多佈署於惡劣環境中且受限於低成本之製作，使得感測元件易成為攻擊者之目標。攻擊者可將惡意程式植入至感測終端元件中，進而達到控制該元件之目的。遠程證實 (Remote Attestation) 方法既為一種透過遠程方式使得驗證者能檢驗感測終端元件內部軟體完整性的機制。可信賴平台模組 (Trusted Platform Module) 是根據可信賴計算組織 (Trusted Computing Group) 建議之規範所實作之防竄改密碼硬體模組。可信賴平台模組可內嵌在一個計算平台中，藉以提供此平台之系統狀態、軟體完整性測量結果與各類密碼演算法。在無線感測網路中，由於對感測終端元件之低成本製作與大規模佈署要求，使得在每一元件內嵌一個可信賴平台模組為一個不合宜方法。對此我們採用叢集式 (Cluster-based) 無線感測網路架構以提升感測網路之存活期與可靠性，同時避免大量增加整體感測網路之布建成本。在此架構下，將感測範圍區域內許多感測終端元件形成數個叢集，每個叢集中有一個計算資源較好且內嵌可信賴平台模組之元件作為叢集頭 (Cluster Head)。 Krauß 等人提出之遠程證實協定允許感測終端元件驗證叢集頭之軟體完整性。在我們研究過程中，發現 Krauß 等人的遠程證實協定造成叢集頭嚴重的儲存負擔，因此我們首先改善 Krauß 等人的方法以降低儲存空間之需求。而在叢集式無線感測網路中叢集頭容易成為攻擊者之目標，我們提出新的協定讓基地台 (Base Station) 能夠驗證叢集頭之完整性。在叢集式架構下，叢集頭負責將感測終端元件在叢集範圍所收集到的資料傳送到遠處的基地台。為了確保資料的正確性，叢集頭必須驗證感測終端元件之完整性，然而因感測元件之低成本需求並不適合在每一元件內嵌可信賴平台模組。為此，我們僅要求感測終端元件內擁有少量的唯讀記憶體 (Read-Only Memory)，提出一個虛擬可信賴平台模組驗證協定，使得叢集頭能驗證感測終端元件的完整性。此外，叢集頭亦可透過此協定與感測終端元件重新建立一把共享金鑰。;Sensor nodes are usually vulnerable to be compromised due to their unattended deployment and the low costs requirement. Thus, an attacker can reprogram the compromised sensor and control the node to act on his behalf. Remote attestation is the activity of making a claim about the internal state of a platform by supplying evidence to a remote veriﬁer. The Trusted Platform Module (TPM) is a tamper-proof hardware based on the Trusted Computing speciﬁcation. A TPM is added to the platform in order to enable functions, such as platform integrity measurement, remote attestation and crypto- graphic functionality. However, in the wireless sensor network, the low cost design and large scale deployment make it infeasible to equip each resource-constrained sensor node with a TPM. We explore the cluster-based sensor network architecture to increase the network lifetime and reliability without signiﬁcantly increasing the cost. The sensor network is organized in clusters where a minority of nodes are equipped with TPMs and act as the cluster heads. In this thesis, we ﬁrst improve Krauβ et al.’s attestation protocol to decrease the storage overhead. Their protocol allows the sensor nodes to verify whether the platform conﬁguration of the cluster head is trustworthy. However, a node acts as the cluster head may be valuable to attack and our new protocol enables the base station to verify the integrity of the cluster head. A cluster head is responsible for verifying the trustworthiness of the sensor nodes within the cluster. The low cost requirement of the sensor node precludes using an expensive hardware, so we propose a virtual TPM attestation protocol. Assuming only a small amount of read-only memory in each sensor node and the cluster head can verify the integrity of each underlying sensor node. Furthermore, the cluster head can re-establish the secret key with the dominated sensor nodes.
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