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研究生： 黃鈺仁
Huang, Yu-Jen.
論文名稱： 一個在行動裝置上安全的即時通訊系統
A Secure Instant Communication System on Mobile Devices
指導教授： 孫宏民
Sun, Hung-Min
口試委員: 許富皓
Hsu, Fu-Hau
黃世昆
Huang, Shih-Kun
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 資訊工程學系
Computer Science
論文出版年： 2019
畢業學年度： 107
語文別： 英文
論文頁數： 40
中文關鍵詞： 即時通訊系統 、單次覆寫 、AES加密 、還原紀錄 、多次覆寫 、刪除
外文關鍵詞： DOD 5220.22-M, Gutmann method, One pass overwrite with check bit, Change data location, Overwrite, Firebase
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    • 近年來LINE、Messenger、Whatsapp、wechat，這些通訊應用隨著智慧型手機的流行，已經成為一般民眾最常用來溝通與聯繫的方式。不過儘管功能類似，但在安全性上卻有相當大的落差目前我們常用的通訊軟體，透過這次研究和分析，明顯看出缺少了哪些地方，我的研究在於提供更好更安全的通訊軟體，給政商人士，保證他們的資訊安全，並且對於程式設計者而言，也能夠保護他們的程式碼不備攻擊者取得，並節省開發時間、成本。
    許多網路上用戶，像是商業人士、政府等等的使用者希望能有安全且隱密的通訊軟體。目前，有許多通訊軟體提供基本功能的即時通訊（IM）服務。
    在這項研究中，我們著重研究與其他通訊軟體的功能差異和保護程式碼，另外提供用戶的匿名性，同時保持真實性。
    保證第三方不會得知傳遞內容，即便取得取用者手機或是入侵。

    Nowadays, IOS System is the most popular smartphone. Instant messaging apps is important in our daily life because there are increasing number of users and people have paid more and more attention to safety Information at present. LINE, Messenger, Whatsapp and wechat has become the most popular Instant messaging apps. I propose analysis result and solution. I have developed a secure Instant messaging app. Businessman and politician hope a secure Instant messaging app. Businessman and politician will pay more attention to the client data. Attacker can steal your data or recovery the data. In this paper, our goal is to provide a secure Instant messaging app, avoid attack and protect data. It can that the data is erased. Lead to attacker not recovery data. I hope to improve efficiency and improve these issues. The traditional method must repeated 3~7 times. Gutmann method must repeated 35 times. Although the data can be completely removed. But the efficiency is very bad.

    Chapter 1 Introduction-----1 1.1 Motivation-----4 1.2 Contribution-----5 1.3 Organization-----5 Chapter 2 Background-----6 2.1 Socket-----6 2.2 XMPP-----7 2.3 Firebase-----8 2.4 OneSignal-----12 2.5 Sinch-----12 2.6 CallKit-----12 Chapter 3 Analysis-----13 3.1 client analysis-----13 3.2.1 recovery data analysis-----15 3.2.2 卓师兄recovery data analysis-----17 3.3 Packet analysis-----19 Chapter 4 Implemenatation-----21 4.1.1 CocoaPods-----21 4.1.2 pods-----22 4.1.3 AppConstant.h-----23 4.2 Features-----24 4.3.1 Delete-----27 4.3.2 Overwrite-----27 4.3.3 DOD 5220.22-M-----31 4.3.4 Gutmann method-----33 4.3.5 One pass overwrite with check bit-----35 4.3.6 Change data location-----37 Chapter 5 Conclusions-----38 Bibliography-----39

    [1] Report of Statista. https://www.statista.com/statistics/258749/most-popular-global-mobile-messenger-apps/

    [2] Report of AMNESTY. https://www.amnesty.org/en/latest/news/2016/10/snapchat-skype-among-apps-not-protecting-users-privacy/

    [3] BlackBerry mobile smart phones. https://blackberrymobile.com/hk/

    [4] Socket. https://en.wikipedia.org/wiki/Network_socket

    [5] XMPP server. https://xmpp.org/about/technology-overview.html

    [6] Openfire server. https://www.igniterealtime.org/projects/openfire/

    [7] Firebase server. https://firebase.google.com/

    [8] Onesignal. https://onesignal.com/

    [9] Sinch . https://www.sinch.com/

    [10] CallKit. https://developer.apple.com/documentation/callkit

    [11] 苹果恢复大师 software. http://m.ifonebox.cn/

    [12] 卓师兄 software. https://www.zhuoshixiong.com/

    [13] IEEE Security analysis testing for secure instant messaging in android with study case: Telegram. http://ieeexplore.ieee.org/document/7849630/

    [14] Cocoapods. https://cocoapods.org/about

    [15] Pods. https://guides.cocoapods.org/using/pod-install-vs-update.html

    [16] Overwrite method. https://www.quora.com/Why-is-a-3-pass-7-pass-or-35-pass-erase-cycle-more-effective-than-a-single-pass

    [17] DOD 5220.22-M technique. https://thestarman.pcministry.com/asm/5220/index.html

    [18] Gutmann method. https://en.wikipedia.org/wiki/Gutmann_method

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