Themis: An accountable blockchain-based P2P cloud storage scheme

Hei, Yiming; Liu, Yizhong; Li, Dawei; Liu, Jianwei; Wu, Qianhong

doi:10.1007/s12083-020-00967-6

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…By default, the data stored by the DCS is available worldwide over a global network of storage nodes. Storj DCS stores data on Nodes that are chosen based on reputation and local latency [94]. This set of Nodes is desired to store chunks of your file, ensuring quick access to data.…”

Section: C: Availabilitymentioning

confidence: 99%

A Comprehensive Survey on Blockchain-Based Decentralized Storage Networks

et al. 2023

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Blockchains are a new approach to creating distributed networks that were first introduced in 2008. It allows the formation of peer-to-peer networks based on consensus, forming chains from accepted blocks without requiring a central authority or centralized controller. A prominent application of this technology is its use in decentralized storage systems. Individuals in decentralized storage networks rent unused hardware storage space to other individuals. A decentralized network utilizing end-to-end encryption eliminates the risk of data loss associated with centralized data control by enabling clients to transmit their files securely. The storage providers must prove that they have kept unaltered files in this network for this time. Many studies have been conducted in this specific domain, most targeting storage capacity and efficiency, but a security, integrity and privacy loophole need to be addressed. This paper presents an overview of blockchain-based storage systems and how they work, followed by a comparison with cloud-based storage networks and a survey of various decentralized storage networks like SIA, File coin, and Storj available on the market. Next, we discuss the advantages and disadvantages of blockchain-based storage. In our final discussion, we examine the security problems of decentralized storage networks and explore potential solutions and research directions for the future.

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Section: C: Availabilitymentioning

confidence: 99%

A Comprehensive Survey on Blockchain-Based Decentralized Storage Networks

et al. 2023

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“…Storj allows the data owner to control and access their data on the network. However, Storj is very costly and depends on a centralized architecture to conclude storage data and payments [7,10]. In contrast, our solution is fully decentralized architecture and avoids a single point of failure.…”

Section: Other Decentralized Data Storage Solutionsmentioning

confidence: 99%

A framework for privacy-aware and secure decentralized data storage

Aslam

Mrissa

2023

COMSIS J

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Blockchain technology gained popularity thanks to its decentralized and transparent features. However, it suffers from a lack of privacy as it stores data publicly and has difficulty to handle data updates due to its main feature known as immutability. In this paper, we propose a decentralized data storage and access framework that combines blockchain technology with Distributed Hash Table (DHT), a role-based access control model, and multiple encryption mechanisms. Our framework stores metadata and DHT keys on the blockchain, while encrypted data is managed on the DHT, which enables data owners to control their data. It allows authorized actors to store and read their data in a decentralized storage system. We design REST APIs to ensure interoperability over the Web. Concerning data updates, we propose a pointer system that allows data owners to access their update history, which solves the issue of data updates while preserving the benefits of using the blockchain. We illustrate our solution with a wood supply chain use case and propose a traceability algorithm that allows the actors of the wood supply chain to trace the data and verify product origin. Our framework design allows authorized users to access the data and protects data against linking, eavesdropping, spoofing, and modification attacks. Moreover, we provide a proof of-concept implementation, security and privacy analysis, and evaluation for time consumption and scalability. The experimental results demonstrate the feasibility, security, privacy, and scalability of the proposed solution.

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“…Recently, the blockchain technique has attracted a lot of attention from many researchers in cloud storage, [20][21][22][23][24][25] distributed deduplication, 26,27 computation task offloading, 28 access control, [3][4][5][6][7][8][9][10][11] and so on. For access control, Maesa et al proposed a blockchain-based approach to exploit the blockchain technique to define access control systems that guarantee the auditability of access control policies evaluation.…”

Section: Blockchain-based Access Controlmentioning

confidence: 99%

Efficient decentralized access control for secure data sharing in cloud computing

Liu

et al. 2021

Concurrency and Computation

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Access control is an important technique in information security that allows legitimate users to gain access to and prevent unauthorized users from getting access to resources in a system. The restriction between access from a user and a shared file of the data owner can be determined by the access policy. In most existing access control models, it is assumed that all entities, including users, the third party, and cloud service provider (CSP), are in the same trust domain. However, in cloud computing environments, it is usually assumed that the CSP cannot be fully trusted, and the data owner (DO) is desired to have the absolute initiative to control data access. This article proposes a blockchain-based access control scheme for cloud computing, in which the DO maintains an access matrix to describe the access policy. Then, the public keys of all nodes and the access matrix are stored in the blockchain, to ensure the security of the proposed scheme. The DOs can encrypt the large shared files once using a symmetric key in a long time. And they also can encrypt the symmetric key in parallel using the public key of authorized users in a short time. Security analysis proves that the proposed scheme is able to prevent outsourced files from unauthorized access and collusion attack. Experimental results show that the proposed scheme outperforms the existing baselines in terms of overheads on computation and storage. On average, the computation overhead of the proposed scheme is lower than that of the scheme SVPAC, PpBAC, and Timely CP-ABE by 25.37%, 45.46%, and 36.44%, respectively. The communication overhead of the proposed scheme is lower than that of the scheme Timely CP-ABE by 17.16%, and it is more secure, although it is higher than that of the scheme SVPAC and PpBAC by 5.88% and 39.05%. And the storage overhead of the proposed scheme is lower than that of the scheme SVPAC, PpBAC, and Timely CP-ABE by 59.36%, 20.25%, and 61.88%, respectively.

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Themis: An accountable blockchain-based P2P cloud storage scheme

Cited by 10 publications

References 21 publications

A Comprehensive Survey on Blockchain-Based Decentralized Storage Networks

A Comprehensive Survey on Blockchain-Based Decentralized Storage Networks

A framework for privacy-aware and secure decentralized data storage

Efficient decentralized access control for secure data sharing in cloud computing

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