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Your search keyword '"Chien-Chung Shen"' showing total 332 results
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332 results on '"Chien-Chung Shen"'

1. Privacy-Preserving Traffic Management: A Blockchain and Zero-Knowledge Proof Inspired Approach

Author

Wanxin Li, Hao Guo, Mark Nejad, and Chien-Chung Shen

Subjects
Blockchain, connected vehicle, data integrity, data privacy, traffic management, vehicular network, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

Incorporation of connected vehicle (CV) data into real-time traffic management systems presents a host of new challenges resulting from the current lack of data integrity and data privacy in traffic networks. Over the past few years, blockchain technologies have been inspiring extensive innovations in the transportation field. However, due to the transparency property, sensitive data stored on the blockchain would be accessible to anyone, resulting in a lack of privacy. In this paper, we propose a decentralized and location-aware architecture to address the data integrity along with the privacy-preserving issues in blockchain-based traffic management systems. Our proposed architecture integrates with permissioned and modular blockchain network and non-interactive zero-knowledge range proof (ZKRP) protocol. We develop the prototype system on the Hyperledger Fabric platform and Hyperledger Ursa cryptographic library. The performance results show that our approach is effective and feasible for real-time traffic management while preserving the data privacy requirements.

Published
2020
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2. Proof-of-Event Recording System for Autonomous Vehicles: A Blockchain-Based Solution

Author

Hao Guo, Wanxin Li, Mark Nejad, and Chien-Chung Shen

Subjects
Autonomous vehicle, blockchain, connected vehicular network, data integrity and privacy, event recording, Hyperledger Fabric, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

Autonomous vehicles are capable of sensing their environment and navigating without any human inputs. However, when autonomous vehicles are involved in accidents between themselves or with human subjects, liability must be indubitably decided based on accident forensics. This paper proposes a blockchain-inspired event recording system for autonomous vehicles. Specifically, we design the mechanism of “Proof-of-Event” with a dynamic federation consensus to achieve indisputable accident forensics by providing trustable and verifiable event information. We propose a dynamic federation consensus scheme to verify and confirm the new block of event data in an efficient way without any central authority. We conduct numerical analyses and prototyped experiments based on the proposed fast leader election algorithm and the Hyperledger Fabric blockchain network. The results show that our system is effective and feasible in generating and storing accident records in blockchain-based vehicular networks. The security capability of the proposed scheme is also discussed against multiple threats and attack scenarios.

Published
2020
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27. A Hybrid Blockchain-Edge Architecture for Electronic Health Records Management with Attribute-based Cryptographic Mechanisms

Author

Hao Guo, Wanxin Li, Mark Nejad, and Chien-Chung Shen

Subjects
FOS: Computer and information sciences, Computer Science - Cryptography and Security, Computer Networks and Communications, Electrical and Electronic Engineering, Cryptography and Security (cs.CR)
Abstract

This paper presents a hybrid blockchain-edge architecture for managing Electronic Health Records (EHRs) with attribute-based cryptographic mechanisms. The architecture introduces a novel attribute-based signature aggregation (ABSA) scheme and multi-authority attribute-based encryption (MA-ABE) integrated with Paillier homomorphic encryption (HE) to protect patients' anonymity and safeguard their EHRs. All the EHR activities and access control events are recorded permanently as blockchain transactions. We develop the ABSA module on Hyperledger Ursa cryptography library, MA-ABE module on OpenABE toolset, and blockchain network on Hyperledger Fabric. We measure the execution time of ABSA's signing and verification functions, MA-ABE with different access policies and homomorphic encryption schemes, and compare the results with other existing blockchain-based EHR systems. We validate the access activities and authentication events recorded in blockchain transactions and evaluate the transaction throughput and latency using Hyperledger Caliper. The results show that the performance meets real-world scenarios' requirements while safeguarding EHR and is robust against unauthorized retrievals., Accepted for publication in IEEE Transactions on Network and Service Management (TNSM)

Published
2023

43. TrCoin: A Blockchain-based Robust Trust Management System for VANET

Author

Chien-chung Shen and Ehsan Meamari

Abstract

In VANET, although data sharing among vehicles improves safety and traffic, malicious data providers might share false information to compromise its effectiveness. One typical solution to address this issue is to manage the trustworthiness of data providers by using feedback received from data users quantifying the veracity of the shared data. However, data users might behave maliciously and share untruthful feedback. This paper introduces TrCoin, a blockchain-based trust management system, for VANET which tackles both fake data and untruthful feedback. TrCoin uses an honesty value calculation algorithm to distinguish honest from malicious data users and filters out the feedback shared by the malicious data users. TrCoin then runs a trust value calculation algorithm to compute the trust values of data providers based on the truthful feedback shared by honest data users. Extensive simulations are conducted to demonstrate the effectiveness of TrCoin under various attack scenarios with false data injection and untruthful feedback.

Published
2022
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