Follow blockchain research across journals, conferences, and preprint repositories.
3,460 results · page 73 of 145
Yilin Yuan, Jianbiao Zhang, Wanshan Xu, Zheng Li
No abstract is available for this record.
M. Lavanya, V. Kavitha
No abstract is available for this record.
Yinjie Zhao, Xin Kang, Tieyan Li, Cheng‐Kang Chu · 5 authors
With the rapid development of blockchain technology in recent years, all kinds of blockchain-based applications have emerged. Among them, the decentralized finance (DeFi) is one of the most successful applications, which is regarded as the future of finance. The great success of DeFi relies on the real-world data which is not directly available on the blockchain. Besides, due to the deterministic nature of blockchain,the blockchain cannot directly obtain in-deterministic data from the outside world (off-chain). Thus, oracles have appeared as a viable solution to feed off-chain data to blockchain applications. In this paper, we carryout a comprehensive study on oracles, especially on DeFi oracles. We first briefly introduce the application scenarios of DeFi oracles, and then we talk about the past of DeFi oracles by categorizing them into several types based on their design features. After that, we introduce five popular DeFi oracles currently in use(such as Chainlink and Band Protocol), with the focus on their system architecture, data validation process,and their incentive mechanisms. We compare these present DeFi oracles from their data trustworthiness,data source trustworthiness and their overall trust models. Finally, we propose a set of metrics for designing trustworthiness DeFi oracles, and propose a potential trust architecture and a few promising techniques for building trustworthiness oracles.
Xue Zhai, Shanchen Pang, Min Wang, Sibo Qiao · 5 authors
Abstract To realize the encryption of document information, authority authentication, and traceability of historical records, we propose a trusted verification scheme (TVS) for office documents to ensure security. Specifically, the scheme is realized by timestamps, smart contracts (or chaincode), and other blockchain technologies. It is based on the features of blockchain, such as security, credibility, immutability, and traceability of network behavior. And the TVS stores users and documents information through blockchain; it can monitor the state changes of office documents in real time by setting the trigger conditions of smart contracts. The experiment indicates that we have realized the real-time monitoring of data and the traceability of historical records. Moreover, we have achieved the purpose of document encryption and authority authentication, ensuring the authenticity and objectivity of data, avoiding the illegal tampering of malicious users to realize the trusted verification for documents.
Harika Narumanchi, Lakshmi Padmaja Maddali, Nitesh Emmadi
Immunity credentials for individuals are essential to ensure safety and security of communities in the current pandemic-stricken world. Immunity credentials can be employed to permit movement of only a certain class of individuals that are least prone to spreading infections, thus reducing the risk for the society as a whole. While the authenticity of the immunity credentials is extremely critical, it is also important to guarantee privacy and confidentiality of the individuals’ personal health information. In this paper, we present a blockchain based immunity credential system that allows users to authenticate immunity credentials in a verifiable manner. We leverage BLS aggregate signature that facilitates credential holders to selectively disclose credentials in a privacy preserving manner. Blockchain acts as single source of trust and ensures authenticity of claims. Our system enables users to reuse the tamper-evident verification status recorded on blockchain to authenticate to same verifiers without need for repeated cryptographic proof verification process. The protocol restricts any intermediaries/third-parties to use the identity or proof without authorization of the user. The protocol is fully automated through smart contracts and makes sure that credential verification is settled in near real time. We chose permissioned blockchain, Hyperledger Fabric (HLF) to implement our protocol as it befits the requirements of this problem and ensures smart contract development that supports user privacy, confidentiality, automated proof generation and verification of immunity credentials.
Sugeng Widada, Warseno, Sugina, Sulthan Taqi Sampoerna Alfian
Blockchain has been an interesting area of exploration for some time and the advantages it provides have been exploited by a variety of different businesses. Basically, the medical service area has benefited greatly from blockchain innovations due to safety, security, confidentiality and decentralization. Overall, the Electronic Wellbeing Record (EHR) system addresses issues related to information security, honesty and fairness. In this paper, we talk about how blockchain innovation can be used to change the EHR framework and can be the answer to this problem. We present a system that can be used for the implementation of blockchain innovations in the field of medical services for EHR. The essence of our proposed system is first and foremost to implement blockchain innovations for EHR and in addition to provide secure electronic records capacity by characterizing granular access rules for clients of the proposed structure. Moreover, this structure also speaks to the flexibility issue that blockchain innovation sees as a whole through the use of the off-chain capacity of the record. This structure gives the EHR framework the advantage of having a blockchain-based setup that is versatile, secure, and basic. The information on the blockchain is apparent to everybody that is available on the chain this makes the information weak which is anything but an ideal result for a decentralized stage.
Meriem Kherbouche, Galena Pisoni, Bálint Molnár
Business process modeling and verification have become an essential way to control and assure organizational evolution. We overview the opportunities for the application of blockchain in Business Process Management and Modeling in Finance and we focus on in-depth analysis of claim process in insurance as a use case. We investigate the utilization of blockchain technology for model checking of Workflow, Business Processes to ensure consistency, integrity, and security in a dynamically changing business environment. We create a UML profile for the blockchain, then we combine it with a UML activity diagram followed by a verification using Petri nets to guarantee a distributed computing system and scalable with mutable data. Our paper creates a unified picture of the approaches towards business processes modeling used in the financial industry organized around the set of premises intending to develop a future research agenda for blockchain business process modeling, specifically for the financial industry domain.
Pratima Sharma, Rajni Jindal, Malaya Dutta Borah
No abstract is available for this record.
Siddhesh Deore, Ruturaj Bachche, Aditya Bichave, Rachana Patil
No abstract is available for this record.
Caijun Zhang, Kaiqiang Xian, Qianjun Wu, Huafei Yang · 6 authors
Due to the hierarchical management structure of electric power enterprises, data flow often needs to go through multiple layers of nodes for review, which makes data synchronization slow and distortion high and data reliability difficult to improve. The existing data asset management mode of electric power enterprises faces security problems such as node trustworthiness and data tampering in the process of identity mutual trust, transmission and storage, data collection and data usage. In view of this, this paper proposes a blockchain-based digital asset management framework using the decentralized, untrustworthy, and hard-to-tamper features of blockchain. In the proposed framework, we optimized security authentication mechanism, data recording and consensus process, and data storage and transmission strategy involved in blockchain data sharing applications. The framework can effectively ensure the security, integrity, operability and consistency of digital assets in the management process under the blockchain environment.
Kithmini Godawatte, Philip Branch, Jason But
Accountability and integrity are likely to play a key role in emerging health sensor network environments. Since health sensor devices are low capability devices, they are particularly susceptible to modern cyber threats. Blockchain technology is an emerging security technology that was explored by researchers in the past few years. Blockchain technology has been designed to protect information integrity and accountability. In a distributed manner making forgery and destruction of data can be very difficult. In this survey paper, we are specifically focused on how blockchain platforms adopt to the healthcare industry and achieve data integrity and accountability. Also, we will discuss the benefits and challenges of blockchain technology, and future blockchain research directions. Blockchain technology can be used to prevent unauthorized information access and enhance the security of sensor data. The use of blockchain technology in health sensor networks may address many of the integrity and accountability concerns of health sensor networks.
Mirek Sopek, Dominik Tomaszuk, Szymon Gła̧b, Filip Turoboś · 9 authors
In this article we present the technological foundations on which an ecosystem of semantic data objects can be implemented on the latest Blockchain based systems. As the most important citizens among the semantic data objects are ontologies, the ecosystem is referred to as Ontospace. The foundations can be characterized by their architectural, cryptographic and transactional aspects. The architectural aspect borrows from the latest Layer-2 protocols of the 3rd generation blockchains and from the rules of Linked Data systems creation. The cryptographic aspect represents an original work that attempts to resolve the issue of efficient hashing of the graph data structures. The transactional aspect is concerned with the graph replication consistency, conditions for the direct access to graph data from the blockchain smart-contracts and with linkage between sidechains bearing semantic objects and the main network. The large parts of the work were implemented in the context of the Ontochain project – a part of the Next Generation Internet EU Initiative.
Jongbeen Han, Yongseok Son, Hyeonsang Eom
As the popularity of e-commerce grows, an electronic coupon (e-coupon) is widely used due to its convenience and portability. In most e-coupon services, the information of e-coupons is managed on a centralized server. However, e-coupon services are often vulnerable to security issues because of centralization. For example, when the e-coupon information which is stored in a centralized e-coupon server is forged, it becomes difficult to match the user and the e-coupon’s owner, and an expired e-coupon can be used repetitively (i.e., double-spending). To handle this issue, we propose a new e-coupon service by exploiting a blockchain system to improve the security of the service. To do this, we first design a server to enable the e-coupon service and communicate with the blockchain system. Second, we devise a smart contract on the blockchain system to provide integrity of the e-coupon business logic and the e-coupon’s information. We implemented the proposed service on an Ethereum-based blockchain system. The experimental results show that our proposed service improves higher security with a minor performance overhead compared with an existing e-coupon service.
Mhamad Bakro, Sukant Kishoro Bisoy, Ashok Kumar Patel, M. Adib Naal
No abstract is available for this record.
Qu Yubin, Wong W. Eric, Li dongcheng
No abstract is available for this record.
M. Sumathi, N. Vijayaraj, S. P. Raja, Venkatachalapathy Maharajan
HIGHLIGHTS The permissioned blockchain is used for resource allocation and monitoring. To reduce storage size, partial data is stored in the onchain blocks instead of entire data. The EU’s based Fixed and variable size resource allocation techniques are proposed.
Shimin Pan, Kwan Yin Chan, Handong Cui, Tsz Hon Yuen
No abstract is available for this record.
M.P. Anuradha, K. Lino Fathima Chinna Rani
No abstract is available for this record.
Vipul Goyal, Abhiram Kothapalli, Elisaweta Masserova, Bryan Parno · 5 authors
No abstract is available for this record.
Zequan Zhou, Xiling Luo, Yi Bai, Xiaochao Wang · 7 authors
Ensuring the integrity of remote data is the prerequisite for implementing cloud‐edge computing. Traditional data integrity verification schemes make users spend a lot of time regularly checking their data, which is not suitable for large‐scale IoT (Internet of Things) data. On the other hand, the introduction of a third‐party auditor (TPA) may bring about greater privacy and security issues. We use blockchain to address the problem of TPA. However, implementing dynamic integrity verification with blockchain is a bigger challenge due to the low throughput and poor scalability of blockchain. More importantly, whether there is a security problem with blockchain‐based integrity verification is not yet known. In this paper, we propose a scalable blockchain‐based integrity verification scheme that implements fully dynamic operations and blockless verification. The scheme builds scalable homomorphic verification tags based on ZSS (Zhang‐Safavi‐Susilo) short signatures. We exploit smart contract technology to replace TPA for integrity verification tasks, which not only eliminates the risk of privacy leakage but also resists collusion attacks. Furthermore, we formally define a blockchain‐based security model and prove that our scheme is secure under the security assumption of cryptographic primitives. Finally, the mathematical analysis of our scheme shows that both the communication complexity and the communication complexity of an audit are O(c), in which c is the number of challenge blocks. We compare our scheme with other schemes, and the results show that our scheme has the lowest time consumption to complete an audit.
C.P. Ravikumar, Isha Batra, Arun Malik
No abstract is available for this record.
Sabri Barbaria, Marco Casassa Mont, Essam Ghadafi, Halima Mahjoubi Machraoui · 5 authors
Nowadays, due to the evolution of information technologies and their adoption in the healthcare domain, new risks to medical data protection and patient privacy are increasingly present. It is therefore important to implement approaches that can prevent rapidly emerging cyber-attacks. Essentially, the adoption of cyber security measures in healthcare should be oriented towards a better assurance of patient rights and consent management. Blockchain is one of the most advanced technologies that can deal with many types of cyber threats ensuring the integrity, availability, and privacy of the data. It adds elements of trust and traceability to the data exchange processes deployed within Hospital information systems and beyond. In this paper, we study the usability of blockchain in the healthcare domain and we develop a data exchange approach based on the Hyperledger Blockchain model. The focus here will be mainly on privacy concerns and the integration of patient consent in the data sharing operational controls.
Shailaja Salagrama, Vimal Bibhu, Ajay Rana
Blockchain is current demanding technology in the field of data and information security. In this paper, we present a model of the data integrity assurance by the use of blockchain. Our proposed method, the message authentication code is stored under the block of blockchain with hash value, timestamp, and nonce. The existing message authentication code, SHA-256 is used to generate the hash value to store into the blockchain after encrypting by asymmetric key cryptography with recipient public key. We also compared the strength of our blockchain based data integrity assurance method with others existing method of integrity assurance and management. We have applied penetration testing by using five different tools to test the strength and robustness of proposed method of integrity assurance. It is found that blockchain based integrity assurance method is more robust than other methods of integrity assurance.
Suruchi Singh, Pankaj Bhatt, K. Nagarajan, Neha P. Singh · 5 authors
No abstract is available for this record.