校園網路惡意無線網路基地台之定位｜國立臺灣科技大學博碩士論文系統

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研究生：	阮懷南 Nguyen Hoai Nam
論文名稱：	校園網路惡意無線網路基地台之定位 Locating Rogue Access Points in a Campus Network
指導教授：	鄭瑞光 Ray-Guang Cheng
口試委員:	王瑞堂 Jui-Tang Wang 馮輝文 Huei-Wen Ferng 許騰尹 Terng-Yin Hsu 鄭瑞光 Ray-Guang Cheng
學位類別：	碩士 Master
系所名稱：	電資學院 - 電子工程系 Department of Electronic and Computer Engineering
論文出版年：	2023
畢業學年度：	112
語文別：	英文
論文頁數：	81
中文關鍵詞：	流氓接入點、室內定位、校園網絡、WiFi 定位
外文關鍵詞：	Rogue Access Points, Indoor Localization, Campus Network, WiFi Positioning
相關次數：	點閱：269 下載：5
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校園 WiFi 網絡可能會受到干擾訪問點（AP）或惡意 AP 的損害。 WiFi 定位在定位和消除上述 AP 類型的威脅中發揮著重要作用。在這個論文中，我們開發了一個名為 CWMS 的校園 WiFi 管理系統。該系統使用在校園部署的 WiFi 控制器的數據，並通過 WISE-PaaS 在 Web 儀表板中呈現。CWMS 包括 WiFi 定位，用於定位校園網絡中的 AP 位置。 WiFi 定位採用了一種通過 AP 位置調整實現低變異性定位的方法，以及一種校準路徑損耗指數的方法，以更好地描述室內環境。

在國立臺灣科技大學（NTUST）的伊陽（IY）大樓進行的 WiFi 定位現場測試檢測到十二個干擾和可疑的惡意 AP，而無需樓層預測不準確。初始估算實現了檢測到的 AP 的平均距離誤差為 4.11 米。應用路徑損耗指數校準方法後，平均距離誤差降低到 3.85 米。

The campus WiFi network can be damaged by interfering access points (APs) or rogue APs. WiFi positioning plays an important role in locating and eliminating threats from the above AP types. In this thesis, we develop a campus WiFi management system, named CWMS. This system uses data from WiFi controllers deployed on campus, and is presented in a Web dashboard using WISE-PaaS. CWMS includes WiFi positioning, which locates the AP locations in the campus network. The WiFi positioning employs a method for low variance positioning through AP location adjustment and a method to calibrate the path loss exponent in order to better characterize the indoor environment.

The WiFi positioning field testing in the Yi-Yang (IY) building at the National Taiwan University of Science and Technology (NTUST) detected twelve interfering and suspected-rogue APs, without inaccuracy in floor prediction. The initial estimation achieved a mean distance error of 4.11 meters for the detected APs. After applying the path loss exponent calibration method, the mean distance error is reduced to 3.85 meters.

Contents
Letter of Authority . . . . . . . . . . . . . . . . . . . . . . . . . . ii
Letter of Authority . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Abstract in Chinese . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Abstract in English . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . v
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
List of Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Campus WiFi Management System . . . . . . . . . . . . 1
2 Indoor WiFi Positioning . . . . . . . . . . . . . . . . . . 2
3 Rogue APs and Interfering APs . . . . . . . . . . . . . . . 5
4 NTUST Campus Network Deployment . . . . . . . . . . . 6
Background Knowledge . . . . . . . . . . . . . . . . . . . . . . 8
1 Simplified Log-distance Path Loss Model . . . . . . . . . 8
2 Trilateration Algorithm . . . . . . . . . . . . . . . . . . . 10
3 Least Squares Algorithm . . . . . . . . . . . . . . . . . . 12
System Architecture . . . . . . . . . . . . . . . . . . . . . . . . 14
Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1 Accessing and Extracting Data . . . . . . . . . . . . . . . 17
2 Database and Storage . . . . . . . . . . . . . . . . . . . . 19
3 WiFi Positioning Flowchart . . . . . . . . . . . . . . . . . 25
4 Data Preparation for WiFi Positioning . . . . . . . . . . . 27
5 AP Location Adjustment . . . . . . . . . . . . . . . . . . 29
6 Path Loss Exponent Calibration . . . . . . . . . . . . . . 31
6.1 Problem . . . . . . . . . . . . . . . . . . . . . . . 31
6.2 Parameters Definition . . . . . . . . . . . . . . . 31
6.3 Equations . . . . . . . . . . . . . . . . . . . . . . 32
6.4 Algorithms . . . . . . . . . . . . . . . . . . . . . 34
7 Data Visualization with WISE-PaaS . . . . . . . . . . . . 40
7.1 Data Visualization for WiFi Positioning . . . . . . 41
Experimental Result . . . . . . . . . . . . . . . . . . . . . . . . 45
1 Floor Prediction . . . . . . . . . . . . . . . . . . . . . . . 46
2 2-D and 3-D Mean Distance Error . . . . . . . . . . . . . 57
3 AP Location Adjustment . . . . . . . . . . . . . . . . . . 59
4 Path Loss Exponent Calibration . . . . . . . . . . . . . . 62
5 Performance Evaluation . . . . . . . . . . . . . . . . . . . 67
6 Web Visualization . . . . . . . . . . . . . . . . . . . . . . 69
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
1 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . 76
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Letter of Authority . . . . . . . . . . . . . . . . . . . . . . . . . . 82
                                

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