Follow blockchain research across journals, conferences, and preprint repositories.
3,460 results · page 37 of 145
Rongxin Guan, Tianxiang Shen, Sen Wang, Gong Zhang · 6 authors
No abstract is available for this record.
Mathias Hall-Andersen, Mark Simkin, Benedikt Wagner
No abstract is available for this record.
Luca Grilli, Paolo Speziali
We present PineSU, a lightweight system that integrates Git with the Ethereum blockchain for sharing electronic documents, enabling decentralized integrity protection and timestamping. PineSU introduces the concept of Storage Unit (SU for short), which is essentially a Git repository along with some descriptor files needed to interact with the blockchain. SUs can be open or closed. Open SUs serve to secure Git repositories whose content may change in the future. At any moment, users can create a Blockchain Synchronization Point (BSP for short) of their open SUs. This allows for a rigorous integrity and authenticity verification of the corresponding digital documents. Whereas closed SUs are mainly a mechanism to invalidate any change to a Git repository. They are useful when a set of files must be definitively archived and made immutable, while enabling their sharing securely. As shown by a case study on clones of two public repositories on GitHub (owned by the Italian government) containing reports and data about the COVID-19 diffusion, PineSU has proven to be very effective in protecting Git repositories under a few security hypotheses that are easy to guarantee in many circumstances. Furthermore, an experimental and simulated performance evaluation demonstrates that the system scales well for storage units of increasing sizes and structure complexity. Finally, a qualitative comparison with existing solutions shows the strengths of PineSU against state-of-the-art approaches.
Xingyu Liang, Sen Wang, Ling Xiong
No abstract is available for this record.
Ashis Kumar Samanta, Nabendu Chaki
No abstract is available for this record.
Tanmay Thakare, Tanay Phatak, Gautam Wadhani, Teesha Karotra · 5 authors
No abstract is available for this record.
Ahmed S. Ghorab, Raed S. Rasheed, Mohammed Saïd Salah, Aiman A. AbuSamra
No abstract is available for this record.
Malik Abdelrahim, Fadi Al‐Turjman
No abstract is available for this record.
Ahmed I. Alutaibi
Every day, a vast amount of data with incalculable value will be generated by the IoT devices that are deployed in various types of applications. It is crucial to ensure the reliability and safety of IoT data exchange in a cloud context because this data frequently contains the user's private information. This study presents a novel encrypted data storage and security system using the blockchain method in conjunction with hybrid optimization-based proxy re-encryption (HO-PREB). Dependency on outside central service providers is eliminated by the HO-PREB-based consensus process. In the blockchain system, several consensus nodes serve as proxy service nodes to restore encrypted data and merge transformed ciphertext with private data. Hybrid owl and bat optimization is employed to select the optimal key for enhancing security. This removes the limitations associated with securely storing and distributing private encrypted data via a distributed network. Moreover, the blockchain's distributed ledger ensures the permanent storage of data-sharing records and outcomes, ensuring accuracy and dependability. The simulated experiments of the designed model are evaluated with existing cryptographic techniques and gain a lower latency of 3.2 s and a lower turnaround time of 45 ms. Furthermore, the developed technique enhances cloud system security and possesses the capability to detect and mitigate attacks in the cloud environment.
Houaida Ghanmi, Nasreddine Hajlaoui, Haifa Touati, Mohamed Hadded · 6 authors
No abstract is available for this record.
Dahong Qian, Yiyang Xu, Yuncong Hu
No abstract is available for this record.
Chunsheng Wang, Xuecheng Yu, Gonghao Tan, Xiaoqiang Li
To ensure the safety of power grid operation and the accuracy of data, it is necessary to solve the problems of credibility and transparency in traditional data auditing systems. In this study, the use of blockchain was proposed to design the system. It is a distributed ledger technology that can definitely provide new solutions for power grid engineering data auditing. In this article, the basic principles and characteristics of blockchain were elaborated in detail, and the application scenarios and advantages of blockchain technology in power grid engineering data audit systems were discussed. The challenges and problems of this technology in the field of power grid were analyzed. The research results indicated that the audit efficiency of the method proposed in this article ranged from 89% to 98%. Blockchain technology can provide advantages such as data security, transparency, traceability, and decentralization for power grid engineering data audit systems.
Šime Jozipović, Marko Perkušić, Nina Mladinić
This paper analyses the legal framework of national virtual currencies and so-called Central Bank Digital Currencies (CBDCs) from a comparative law perspective. The authors define the meaning of the terms “means of payment” and “legal tender” and determine the legal consequences of classifying certain means of payment as legal tender. Building on this, the authors present new developments in the field of sovereign virtual currencies and shed light on their evolution through a comparative legal analysis of various national virtual currencies. In this context, the authors present developments in various African countries, Venezuela’s initiative to introduce the first state-backed crypto token, the first CBDC pilot projects in Uruguay and China, and considerations to introduce a CBDC in the EU. Based on the analyzed systems, problems regarding privacy, user protection and effective regulation of transactions are highlighted in order to present the legal challenges for the establishment of a fully functional (supra-)national euro CBDC.
Huawei Huang, Zhaokang Yin, Qinglin Yang, Taotao Li · 7 authors
Metaverse brings unlimited space and tremendous potential since it is an integrated application of multiple fundamental technologies such as artificial intelligence, blockchain, networking, Internet of Things, and interactivity. During those building blocks of metaverse, blockchain is a type of technology operated by a group of individual participants and known for its immutability feature. The massive adoption of blockchain has been severely prevented by various security and scalability issues in blockchain-based applications due to the inherent characteristics of this technology. To accelerate the massive adoption of blockchain, many previous studies have been carried out to address the security and scalability issues. This article reviews blockchain-related publications collected from four major security conferences (i.e., NDSS, CCS, S&P, and USENIX Security) published in the past three years. Through this overview, we disclose the security and scalability issues of mainstream blockchains such as Bitcoin and Ethereum. Our study aims to help researchers better understand the bottleneck of blockchain-empowered metaverse, and how to address user requirements for security and scalability from the perspective of blockchains.
Anupama Singh, Satish S. Salunkhe
No abstract is available for this record.
Ervin Domazet, Gunter Merdzan, Violeta Cvetkoska, Daniela Mechkaroska · 6 authors
Blockchain is a distributed ledger technology that can revolutionise the banking sector by increasing transparency, reducing costs, and enhancing security. However, the success of any banking service lies in the efficiency of serving it, which depends on the smoothness of internal documents and process flows. This paper proposes a novel method that uses blockchain infrastructure to address the efficiency, security, and privacy of workflow processes in the banking sector. Our approach combines Alfresco DMS and CMIS with the orchestration tool Camunda for workflow management and secures them with a notary using the Factom Blockchain. This method provides a secure, efficient, and reliable way for banks to process transactions, store documents, and manage their processes. It will enable banks to process transactions faster, reduce costs, minimise the risk of fraud, increase customer satisfaction, and fully consider blockchain technology's advantages.
Oskar Petto, Thomas Preindl, Martin Kjäer
No abstract is available for this record.
Jing Wang, Xue Yuan, Yingjie Xu, Yudi Zhang
Large language models (LLMs) have brought significant advancements to artificial intelligence, particularly in understanding and generating human language. However, concerns over management burden and data security have grown alongside their capabilities. To solve the problem, we design a blockchain‐based distributed LLM framework, where LLM works in the distributed mode and its outputs can be stored and verified on a blockchain to ensure integrity, transparency, and traceability. In addition, a multiparty signature‐based authentication mechanism is necessary to ensure stakeholder consensus before publication. To address these requirements, we propose a threshold elliptic curve digital signature algorithm that counters malicious adversaries in environments with three or more participants. Our approach relies on discrete logarithmic zero‐knowledge proofs and Feldman verifiable secret sharing, reducing complexity by forgoing multiplication triple protocols. When compared with some related schemes, this optimization speeds up both the key generation and signing phases with constant rounds while maintaining security against malicious adversaries.
Fazal Raheman
With one billion users using 380 exchanges, the security of blockchains and cryptocurrencies remains a major concern as billions are lost to hackers every year. Cryptocurrency hacks negatively impact cryptocurrency markets introducing volatility. Each major scam/hack incident results in a significant price dip for most cryptocurrencies, decelerating the growth of the blockchain economy. Existing blockchain vulnerabilities are further amplified by the impending existential threat from quantum computers. While there’s no reprieve yet from the scam/hack prone blockchain economy, quantum resilience is being aggressively pursued by post quantum cryptography (PQC) researchers, despite 80 of 82 candidate PQCs failing. As PQC has no role in combating inherent vulnerabilities, securing over 1000 existing blockchains against scammers/hackers remains a top priority for this industry. This research proposes a novel Quantum-safe Ledger Technology (QLT) framework that not only secures DLTs/cryptocurrencies and exchanges from current vulnerabilities but protects them from the impending Q-day threats from future quantum computers. As blockchain-agnostic technology, the QLT framework can be easily adapted to secure any blockchain or crypto exchange.
Cristina Muñoz-Higueras, Ana Maria Serradilla-Gil, Pilar Moreno-Colmenero, Francisco J. Quesada
No abstract is available for this record.
Ruqaya Abdelmagid, Mohamed Abdelsalam, Fahad Kamal Alsheref
This paper proposes a framework to solve academic certificate fraud by implementing a blockchain network. A permission Hyperledger Fabric network is deployed to store students’ information and allows the proper access to guarantee the system's security. The paper discusses several studies that introduce variants of solutions for the academic certification tampering problem by using blockchain technology. It finds Hyperledger Fabric secure, and performant with higher TPS than Bitcoin and Ethereum; latency increases with participant number.
Xiaotong Li, Hao Wang, Jiyang Chen, Shikuan Li · 6 authors
No abstract is available for this record.
Yong Zhou, Hong Lei, Zijian Bao
Charity donations are a critical mechanism for social resource distribution. However, traditional donation systems, typically centralized, are prone to issues such as data redundancy, vulnerability to single-point failures, and a deficiency in transparency and traceability. Although blockchain-based donation programs have emerged to address trust issues inherent in centralized models, they often neglect critical security concerns like privacy protection and identity authentication. This paper introduces Eisdspa, a blockchain-based donation system designed to offer identity authentication, auditability, and privacy protection. Specifically, we introduce an identity credential system that facilitates anonymous donations, shielding the identities of both donors and donees through the use of BBS+ signatures and zero-knowledge proofs of knowledge (ZKPoKs). Additionally, we ensure the integrity of goods donations by offering robust auditability and protecting user privacy with Pedersen commitments and ZKPoKs. We formally define the privacy aspects of Eisdspa and conduct a security analysis of the system under the random oracle model. A prototype implementation of the scheme, along with a comparative analysis with existing solutions, highlights the benefits of Eisdspa. Moreover, we assess the computational efficiency of Eisdspa, with experimental results indicating its high performance in computational overhead.
Yiming Li, Shengli Liu
No abstract is available for this record.