MULTI-USER SECURITY FOR MULTICAST COMMUNICATIONS

The ubiquity of communication networks is facilitating the development of wireless and Internet applications aimed at allowing users to communicate and collaborate amongst themselves. In the future, group-oriented services will be one of the dominant services that facilitate real-time information exchange among a large number of diverse users. However, before these group-oriented services can be successful deployed, technologies must be developed to guarantee the security of the information and data exchanged in group communications. Among all security requirements of group communication, access control is paramount as it is the first line of defense that prevents unauthorized access to the group communication and protects the value of application data…

Contents

1 Introduction
1.1 Motivation
1.2 Security Issues in Group Communications
1.2.1 Access Control and Data Confidentiality
1.2.2 Service Authentication and Verification
1.3 Key Management for Group Access Control
1.3.1 Centralized Key Management
1.3.2 Contributory Key Management
1.4 Thesis Overview and Contribution
2 Topology-aware Key Management for Wireless Networks
2.1 Introduction
2.2 Topology-Matching Key Management Tree
2.3 Handoff Schemes for TMKM Tree
2.4 Performance Analysis
2.5 Separability of the Optimization Problem
2.6 Design of the TMKM Tree
2.6.1 Dynamic membership model
2.6.2 ALX tree structure
2.6.3 User subtree design
2.6.4 BS subtree design
2.6.5 SH subtree design
2.7 Simulation Results
2.7.1 One-SH systems
2.7.2 Multiple-SH systems
3 Hierarchical Group Access Control
3.1 Introduction
3.2 Hierarchical Access Control for Group Communications
3.2.1 System description
3.2.2 Security requirements
3.2.3 Data encryption and hierarchical key management
3.3 Centralized Multi-group Key Management Scheme
3.3.1 Employing independent key trees to achieve hierarchical access control
3.3.2 Multi-group key management scheme
3.4 Performance Measures and Analysis
3.4.1 Storage overhead
3.4.2 Rekey overhead
3.5 Simulations and Performance Comparison
3.5.1 Statistical dynamic membership model
3.5.2 Performance with different group size
3.5.3 Scalability
3.5.4 Performance with different transition probability
3.5.5 Simulation of multi-service applications
3.6 Contributory Multi-group Key Management
4 Protecting Dynamic Group Information in Secure Multicast
4.1 Introduction
4.2 GDI Attacks on Centralized Key management
4.2.1 Attack A1: Estimation of the number of join/departure users by inside attacker
4.2.2 Attack AII: Estimation of group size from rekeying message size
4.2.3 Vulnerability of popular centralized key management schemes
4.3 Anti-attack Techniques
4.4 Performance Measure and Optimization
4.4.1 The leakage of GDI
4.4.2 Communication overhead
4.4.3 System optimization
4.5 Simulations of the anti-attack scheme
4.6 Contributory Key Management Schemes
4.6.1 Fully and partially contributory key management schemes
4.6.2 Vulnerability of popular contributory key management schemes
4.6.3 Prevention of GDI leakage
5 Conclusion and Future Work
A Calculation of B(b; i; a)
B Calculation of pmf of eI
Bibliography

Author: Sun, Yan

Source: University of Maryland

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