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Models and constructions for secure reputation systems / M.Sc. Jakob Juhnke ; Supervisor: Prof. Dr. rer. nat. Johannes Blömer. Paderborn, 2019
Inhalt
Introduction
Preliminaries
Notation
Cryptographic Primitives
Hash Functions and Random Oracles
Commitment Schemes
Public-Key Encryption
Digital Signatures
Group Signatures
Interactive Proofs
Non-Interactive Proofs
Group Generators and Bilinear Maps
Cryptographic Hardness Assumptions
Decisional Assumptions
Computational Assumptions
Reputation Systems and their Security
Essential Functionality
Attacks against Reputation Systems
Unfair Feedback
Inconsistent Behavior
Identity-based Attacks
Desired Properties and Cryptographic Considerations
Models and Constructions for Secure Reputation Systems
A Model for Reputation Systems
Architecture and Algorithms
Security Notions
Discussion
Construction of a Reputation System
Building Blocks and Intuition
The Reputation System
Universal Composability
Protocol Execution and Security
Technical Details
Reputation Systems in the Universal Composability Framework
An Ideal Functionality for Reputation Systems
Intuition
The Formal Definition
Security Properties
Realizing Reputation Systems
Building Blocks and Intuition
The Protocol
Further Extensions and Future Research
Considering Adaptive Adversaries against FRS
Incorporating Revocation into FRS and PRS
Attribute-based Ratings
Security Proofs
Experiment-based Security
Proof of Anonymity
Proof of Public Linkability
Proof of Traceability
Proof of Strong Exculpability
UC-Security
Foundations
Definition of the Simulator
Indistinguishability of the Ideal and Real Protocols
The Reductions used within the Security Proof
Bibliography
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