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Title Page
Contents
1. Introduction 7
1.1. Smartphone Security 8
2. Security Architectures of Smartphone Operating Systems 11
2.1. Isolation 14
2.2. Privilege System 15
2.3. Centralized Distribution 15
3. Security Analysis of Smartphone Operating Systems 18
3.1. On Isolation 18
3.1.1. Inter-Application Communication 18
3.1.2. Other Issues 19
3.2. On Privilege System 19
3.2.1. Inter-Application Communication & Other Issues 19
3.2.2. Over Declaration 20
3.2.3. Usability 21
3.3. On Centralized Distribution 21
4. Security Systems 23
4.1. Pre-Install-Time 23
4.1.1. On Privilege Validation 23
4.1.2. On Vulnerability Detection 24
4.1.3. On Malware Detection 24
4.2. Install-Time and Pre-Runtime 24
4.2.1. On Privilege Warning 25
4.2.2. On Selective Privileges 25
4.3. Runtime 26
4.3.1. On Inter-Application Communication 26
4.3.2. Others 28
5. A Proposal for an Advanced Privilege System 29
5.1. Observation 29
5.2. Design 31
5.2.1. Application Level 31
5.2.2. Inter-Application Level 33
5.2.3. Component Level 36
6. Conclusion 42
7. References 43
8. Abstract 49
[Table 1] Layered Architectures of Android and Windows Phone 13
[Table 2] Security Features 17
[Table 3] Analysis of Security Features 22
[Table 4] Security Systems 28
[Figure 1] Android Architecture 12
[Figure 2] Windows Phone Architecture 13
[Figure 3] Code Snippet for Camera App (Application Level) 34
[Figure 4] Code Snippet for SNS App (Application Level) 34
[Figure 5] Code Snippet for Camera App (Inter-Application Level) 36
[Figure 6] Code Snippet for SNS App (Component Level) 37
[Figure 7] Code Snippet for Camera App (Component Level) 38
[Figure 8] Code Snippet for Camera App 39
[Figure 9] Privilege Section upon Installation of Camera App 40
[Figure 10] Privilege Section upon Installation of Camera App (Simplified) 40
[Figure 11] Code Snippet for SNS App 41
[Figure 12] Privilege Section upon Installation of SNS App 41
초록보기 더보기
This century has seen rapid development in smartphones and smartphones have already been an essential part of modern life. However, the powerfulness of smartphones and the precious information they possess have also attracted an increasing number of malicious activities. In the dissertation, the architectures and the security features of different smartphone operating systems are compared, and the weakness of the security features are discussed. In addition, existing security enhancement for smartphone operating systems are summarized and analyzed. Furthermore, based on the insights of smartphone security from comparison and analysis, refinement for a joint system of privileges and inter-application communication for smartphones is proposed in order to provide better security.
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