Consortium networks are usually constructed among enterprises and organizations. A consortium network is a specific type of decentralized network which only has a limited number of untrusted nodes. Consortium systems ...
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This paper introduces a novel filesystem, ScaleDFS, designed to accelerate decentralizedfile sharing for a private network, leveraging the potential of scaling file management based on directed acyclic graph (DAG) o...
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ISBN:
(纸本)9798400704130
This paper introduces a novel filesystem, ScaleDFS, designed to accelerate decentralizedfile sharing for a private network, leveraging the potential of scaling file management based on directed acyclic graph (DAG) on modern hardware. Specifically, in Sca1eDFS, we first design a DAG builder that parallelizes the construction of DAG nodes for a file while preserving critical orders to speed up the uploading process. Second, we introduce a DAG reader that retrieves leaf DAG nodes in parallel without graph traversal assisted by a devised DAG cache to accelerate the downloading process. Finally, we present a DAG remover that rapidly identifies obsolete DAG nodes/data and removes them in parallel to mitigate the garbage collection overhead without compromising consistency. We implement Sca1eDFS based on IPFS and demonstrate that Sca1eDFS outperforms IPFS by up to 3.7x, 1.8x, and 12.6x in realistic file, private blockchain, and gateway workloads, respectively.
Blockchain technology has a great potential for improving efficiency, security and privacy of Electronic Health Records (EHR) sharing systems. However, existing solutions relying on a centralized database are suscepti...
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Blockchain technology has a great potential for improving efficiency, security and privacy of Electronic Health Records (EHR) sharing systems. However, existing solutions relying on a centralized database are susceptible to traditional security problems such as Denial of Service (DoS) attacks and a single point of failure similar to traditional database systems. In addition, past solutions exposed users to privacy linking attacks and did not tackle performance and scalability challenges. In this paper, we propose a permissioned Blockchain based healthcare data sharing system that integrates Blockchain technology, decentralized file system and threshold signature to address the aforementioned problems. The proposed system is based on Istanbul Byzantine Fault Tolerant (IBFT) consensus algorithm and Interplanetary filesystem (IPFS). We implemented the proposed system on an enterprise Ethereum Blockchain known as Hyperledger Besu. We evaluated and compared the performance of the proposed system based on various performance metrics such as transaction latency, throughput and failure rate. Experiments were conducted on a variable network size and number of transactions. The experimental results indicate that the proposed system performs better than existing Blockchain based systems. Moreover, the decentralized file system provides better security than existing traditional centralized database systems while providing the same level of performance.(c) 2021 The Authors. Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).
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