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PriTKT: A Blockchain-Enhanced Privacy-Preserving Electronic Ticket System for IoT Devices
Yonghua Zhan1, Feng Yuan2, Rui Shi3
1College of Computer and Data Science, Fuzhou University, Fuzhou 350108, China.
Sensors (Basel, Switzerland)
|January 23, 2024
Summary
This study introduces PriTKT, a novel blockchain-based electronic ticketing system. It enhances privacy and security for IoT devices, addressing challenges like flexibility and data protection in e-ticket adoption.
Area of Science:
- Computer Science
- Information Security
- Blockchain Technology
Background:
- Electronic tickets (e-tickets) offer convenience but face challenges in flexibility, privacy, and secure storage.
- Existing e-ticket systems often fail to balance unforgeability, authenticity, and user privacy.
- Deployment on Internet of Things (IoT) devices like smartphones remains a significant hurdle for current e-ticket solutions.
Purpose of the Study:
- To develop an advanced e-ticket system that ensures unforgeability and authenticity while preserving user privacy.
- To address the limitations of existing e-ticket schemes, particularly concerning privacy and usability on IoT devices.
- To create a flexible and secure e-ticketing solution suitable for widespread adoption.
Main Methods:
- The proposed system, PriTKT, integrates blockchain, structure-preserving signatures (SPS), unlinkable redactable signatures (URS), and zero-knowledge proofs (ZKP).
- It implements policy-based ticket purchasing, enabling users to selectively disclose attributes in compliance with GDPR's data minimization principles.
- The system leverages blockchain's decentralization and immutability for effective double-spending detection and tracing.
Main Results:
- PriTKT ensures user unlinkability and supports flexible, policy-based ticket purchasing.
- Users can selectively reveal necessary attributes, enhancing privacy and compliance with regulations like GDPR.
- The system effectively detects and traces double spending of e-tickets due to blockchain's inherent properties.
- By replacing burdensome ZKPs with URS/SPS or efficient ZKPs, the efficiency of ticket issuing is significantly improved, making it smartphone-compatible.
Conclusions:
- PriTKT offers a robust and efficient solution for privacy-preserving electronic ticketing on IoT devices.
- The system enhances security, flexibility, and user privacy, overcoming limitations of previous e-ticket schemes.
- PriTKT's design is suitable for practical deployment on smartphones, paving the way for broader e-ticket adoption.
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