Security and performance considerations in wireless networks.

機譯：無線網絡中的安全性和性能注意事項。

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The open and shared nature of the wireless medium makes it easy for adversaries to launch simple, yet effective, denial of service attacks (DoS attacks). As an example, jamming attacks, involve the uncoordinated transmission of electromagnetic energy on the medium. In a carrier sensing network (e.g., 802.11), this attack strategy increases the number of collisions at the receiver side and/or blocks the medium access to legitimate nodes at the transmitting side. Both of the above effects degrade the wireless network performance significantly. Frequency hopping (FH) has been traditionally used to overcome jamming attacks. However, we analytically and experimentally show that FH is inadequate to efficiently cope with jamming in today's networks.;Later we propose a suite of systems that aim at coping with jamming attacks at various levels (i.e., detection, localization and prevention). We first identify two intelligent and effective jamming attacks that can be launched in 802.11 WLANs and we provide robust detection systems. In particular, we design and implement (i) CMD, a system to detect active jamming attacks that exploit the carrier sensing functionality of 802.11 networks and (ii) FIJI, a cross-layer system for detecting (and mitigating) jamming attacks that exploit the performance anomaly of 802.11 WLANs. Furthermore, given the importance of locating the jamming device in many deployment scenarios (e.g., battlefield), we propose a lightweight jamming localization scheme. Our system utilizies ideas borrowed from the gradient descent optimization method. The system's evaluations, show the potentials and applicability of our localization strategy. The final step for coping with jamming attacks is jamming prevention. Based on our initial measurement driven analysis, we do not rely on a FH scheme, that tries to simply avoid the jammer. On the contrary, we design, implement and evaluate a prevention system, called ARES (Anti-jamming REinforcement System), to fight against the saboteur. ARES is applicable to carrier sensing networks and tunes the parameters of rate adaptation and power control to improve the performance under the presence of an attack while ensuring that operations under benign conditions are unaffected. Our extensive evaluations, show that ARES improves the network throughput across all scenarios by up to 150%.

機譯：無線介質的開放性和共享性使攻擊者可以輕松發起簡單但有效的拒絕服務攻擊（DoS攻擊）。例如，干擾攻擊涉及電磁能量在介質上的不協調傳輸。在載波偵聽網絡（例如，802.11）中，該攻擊策略增加了接收方的沖突數量和/或阻止了介質對發送方的合法節點的訪問。以上兩種效果都會大大降低無線網絡的性能。傳統上，跳頻（FH）用于克服干擾攻擊。但是，我們通過分析和實驗表明，跳頻不足以有效應對當今網絡中的干擾。;后來，我們提出了一套旨在應對各種級別（即檢測，定位和預防）的干擾攻擊的系統。我們首先確定可以在802.11 WLAN中發起的兩種智能有效的干擾攻擊，然后提供強大的檢測系統。特別是，我們設計和實現（i）CMD，一種用于檢測利用802.11網絡的載波偵聽功能的活動干擾攻擊的系統，以及（ii）FIJI，一種用于檢測（并緩解）利用該干擾的干擾攻擊的跨層系統802.11 WLAN的性能異常。此外，鑒于在許多部署場景（例如戰場）中定位干擾設備的重要性，我們提出了一種輕量級的干擾定位方案。我們的系統利用了從梯度下降優化方法中借鑒的思想。該系統的評估顯示了我們本地化策略的潛力和適用性。應對干擾攻擊的最后一步是防止干擾?；谖覀冏畛醯臏y量驅動分析，我們不依賴于FH方案，該方案試圖避免干擾。相反，我們設計，實施和評估一種稱為ARES（抗干擾強化系統）的預防系統，以打擊破壞分子。 ARES適用于載波偵聽網絡，它可以調整速率調整和功率控制的參數，以在存在攻擊的情況下提高性能，同時確保在良性條件下的操作不受影響。我們的廣泛評估表明，ARES在所有情況下均可將網絡吞吐量提高多達150％。

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Pelechrinis, Konstantinos.;
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University of California, Riverside.;

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授予單位 University of California, Riverside.;
學科 Engineering Computer.;Computer Science.
學位 Ph.D.
年度 2010
頁碼 166 p.
總頁數 166
原文格式 PDF
正文語種 eng
中圖分類
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Security and performance considerations in wireless networks.

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