Vehicular Ad Hoc Networks (VANETs) play a vital role in enabling smart transportation systems by facilitating communication between vehicles. However, existing vehicular announcement systems face two major challenges: preserving user privacy and motivating users to share reliable traffic information. In this paper, we propose CreditCoin, a privacy-presing blockchain-based incentive announcement network. The system utilizes an anonymous vehicular announcement aggregation protocol combined with blockchain technology to ensure secure, tamper-resistant, and decentralized communication. Users can broadcast traffic updates anonymously while earning incentives for participation, thereby improving network reliability. A Trace Manager enables conditional privacy by identifying malicious users without compromising honest participants. The proposed system is implemented using Python, Web3, and a simulated VANET environment. Experimental results demonstrate improved efficiency, reduced computation time, and enhanced data reliability compared to traditional approaches. This work contributes toward secure and incentive-driven communication in smart transportation systems. In this paper, we propose CreditCoin, a privacy-preserving blockchain-based incentive announcement network. The system utilizes an anonymous vehicular announcement aggregation protocol combined with blockchain technology to ensure secure, tamper-resistant, and decentralized communication. Users can broadcast traffic updates anonymously while earning incentives for participation, thereby improving network reliability. A Trace Manager enables conditional privacy by identifying malicious users without compromising honest participants. Keywords— VANET; Blockchain; Privacy Preservation; Incentive Mechanism; Smart Vehicles; CreditCoin
Hanyue Guo, Jiting Zhou, Jiaqi Wang, Xiaodong Wang
Leakage of user privacy and vandalism of the sharing bike have been the most serious problem since sharing bike came on the scene. Accordingly, it is very urgent to rebuild the underlying trust mechanism. Most bike sharing systems are centralized, leading to overpressure on the central server. This paper proposes a bike sharing system based on blockchain service platform and a shared operation mode of C2C. The system uses the blockchain system as the trust guarantee. The extra chain payment - lightning network is used to improve the efficiency of the blockchain system and the smart contract is used to provide the rights and interests of the two parties.
Healthcare data exists in silos. These siloed systems lack open standards surrounding how data is stored, labeled, and tagged. In turn, these data silos decrease data liquidity, or the ability of data to flow throughout the healthcare system. Undeniably, the healthcare industry sees the value in responsibly sharing health data to extract more value and new insights using predictive analytics, open science, and collaborative solutions. Effective collaboration requires collaborative data. Particularly with health-related data, “sending that data from one peer to another in a secure manner, in a compliant manner, and in a transparent manner” is vital. While organizations share this sentiment, a complex regulatory framework combined with data usage agreements and non-interoperable, proprietary databases add friction to this data exchange. Particularly in healthcare, blockchain enables greater transparency between healthcare professionals sharing data, and it empowers patients to have control over their data. First, this paper briefly discusses blockchain. Next, this paper outlines issues that plague the healthcare industry including the laws that serve as the framework. Finally, this paper discusses architecture considerations for a blockchain based healthcare data exchange that also respects the current regulatory environment.
Digital identities and credentials are gradually replacing physical documents, as they can be verified with more accuracy and efficiency. Since online privacy is becoming more crucial than ever, it is essential to preserve the privacy of individuals whenever possible. Therefore, anonymous attestation of digital credentials should be feasible, where provers can selectively disclose attributes and create abstractions over attributes in their credential, in order to solely disclose the minimum amount of information required to complete the goal of verification.<br/><br/>Many schemes in the field of attribute-based credentials consider a single root authority issuing credentials to provers. This is coherent to the traditional way of the issuance of credentials since the process of producing physical documents is costly to distribute to multiple issuers. Digital identities provide the opportunity for authorities to distribute credential issuance rights (consecutively) to smaller entrusted entities.<br/><br/>To the best of our knowledge, we propose the first protocol which combines both anonymous attestation with attribute-based credentials and the delegation of selective signing rights for the issuance of these credentials. Root authorities could delegate signing rights for selective attributes consecutively to trustees, which are able to create anonymous attribute-based credentials with the acquired attributes for provers. Verifiers are able to verify presentation tokens with solely the public key of the root authority, without gaining knowledge about the identities of the prover and intermediate delegators. We introduce three adapted signature schemes based on existing work in order to realize a concrete instantiation of the protocol. Anonymity is achieved by incorporating Schnorr's zero-knowledge proof of knowledge with bilinear pairings to efficiently prove the correctness of presentation tokens.<br/><br/>We realized a prototype of our concrete instantiation and optimized the verification algorithm in order to achieve optimal pairing performance. Complexity analysis of the protocol shows improvement in efficiency by aggregating attribute signatures throughout signing right delegation. Experimental results demonstrate a degree of practical feasibility for the verification of presentation tokens on commodity hardware within the challenging public transportation access control time bound of 300 ms.<br/>
With the development of the Internet of Things, a complex CPS system has emerged and is becoming a promising information infrastructure. In the CPS system, the loss of control over user data has become a very serious challenge, making it difficult to protect privacy, boost innovation, and guarantee data sovereignty. In this article, we propose HyperNet, a novel decentralized trusted computing and networking paradigm, to meet the challenge of loss of control over data. HyperNet is composed of the intelligent PDC, which is considered as the digital clone of a human individual; the decentralized trusted connection between any entities based on blockchain as well as smart contract; and the UDI platform, enabling secure digital object management and an identifier-driven routing mechanism. HyperNet has the capability of protecting data sovereignty, and has the potential to transform the current communication-based information system to the future data-oriented information society.
A device-to-device (D2D) underlying cellular network is pervasive to support various wireless applications. However, due to the dramatic increase of data transmission in the network with limited amount of wireless resource, a few users may be required to temporarily disconnect from the network to avoid the interruption of data transmission in the whole network. A critical issue of determining the user access in D2D underlying networks is the authenticity of channel state information (CSI), and usually, a user with a higher CSI can be allocated a larger amount of wireless resource or have a higher probability of staying in the network. In this paper, we propose a blockchain consensus-based scheme to verify the authenticity of CSI and add the users who intentionally advocate a higher value of CSI into a fraud chain. Also, we consider both the cross-tier interference caused by a mobile user and the presence of a user in the fraud chain to determine the access of a user. The analysis results show that our proposed user access scheme can enhance the network performance by efficiently controlling the use access in mobile applications.
Electronic Health Records (EHRs) are both crucial and sensitive as they contain essential information and are frequently shared among different parties including hospitals, pharmacies or private clinics. This information must remain correct, up to date, private, and accessible only to the authorized people. Moreover, the access must also be assured under special conditions mass crises like hurricanes or earthquakes where disruption, decentralized responses, and chaos could potentially lead to wrong procedures or even malicious behaviors. The introduction of blockchain a distributed ledger where the records are stored in a linked sequence of blocks and are theoretically difficult to delete or tamper with made possible to design and implement new solutions for more failure-resistant EHRs applications adopting a distributed and decentralized philosophy, in contrast with the central ones based on cloud infrastructures or even local solutions. In this context, this work provides a systematic study to understand whether permissioned blockchain implementations could be of any benefit to managing health records in emergency situations caused by natural disasters. After the design and implementation of a basic prototype for an EHRs management system in Hyperledger Fabric and the execution of a set of test cases based on the simulation of the Haiti earthquake of 2010, it was possible to discuss the benefits and tradeoffs that the system entails. The discussion focused on the performance parameters like throughput, latency, memory and CPU usage. The system allowed the patients and practitioners to share and access EHRs and be able to detect and react to the crisis situations. Moreover, it behaved correctly in the presence of malicious nodes assuring throughputs and latencies still lower, compared to current centralized systems like credit card payments, but already up to two orders of magnitude higher than permissionless blockchain implementations. Even though there is still a lot of work to do, the system represented by the prototype could be an interesting alternative for networks of healthcare companies to help ensuring the continuity of treatment while preserving privacy and confidentiality in extreme situations.