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An Extensible Consensus Algorithm Based on PBFT

An Extensible Consensus Algorithm Based on PBFT

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Yixin Li Zhen Wang Jia Fan Yue Zheng Yili Luo Chunhua Deng Jianwei Ding The school of information science and technology Southwest Jiaotong University Chengdu China Science and Technology on Communocation Security Lab Chengdu China

Practical Byzantine Fault Tolerance (PBFT) is a deterministic consensus algorithm, which is widely used in blockchain due to the advantage of no forks. However, PBFT still has some problems, such as not being suitable for dynamic networks, requiring large communication overhead, and not being able to identify Byzantine nodes. Therefore, we propose Extensible-PBFT (EPBFT) consensus algorithm, it can take different steps to reach consensus according to the network environment of the system. Firstly, we add the election of consensus nodes based on verifiable random function (VRF), which makes EPBFT suitable for dynamic networks. Then, we modify the consistency protocol so that EPBFT can reach consensus with less communication in a stable network, and it can also identify Byzantine nodes and reduce confirmation latency. Finally, we simplify the checkpoint protocol and the view-change protocol, reducing the time and communication overhead they require.

关键词： Consensus algorithm Protocols Voting Blockchain Digital signatures Hash functions

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Accountable Data Sharing Scheme Based on Blockchain and SGX

Accountable Data Sharing Scheme Based on Blockchain and SGX

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Yili Luo Jia Fan Chunhua Deng Yixin Li Yue Zheng Jianwei Ding The school of information science and technology Southwest Jiaotong University Chengdu China Science and Technology on Communocation Security Lab Chengdu China

Nowadays, data has been more intensive and collaborative than in the past. In this paper, we propose a new accountable data sharing scheme based on blockchain and SGX, in which data subscription undeniable. By utilizing blockchain, the records of users data sharing acts are tamper-resistant, and our scheme no longer needs a trusted third party. SGX ensures the confidentiality of sharing data.

关键词： Blockchain Peer-to-peer computing Hash functions Data privacy Distributed databases Encryption

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A Survey on Range Proof and Its Applications on Blockchain

A Survey on Range Proof and Its Applications on Blockchain

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Chunhua Deng Jia Fan Zhen Wang Yili Luo Yue Zheng Yixin Li Jianwei Ding The school of information science and technology Southwest Jiaotong University Chengdu China Science and Technology on Communocation Security Lab Chengdu China

Blockchain is one of the hot research technologies recently. Blockchain-based distributed ledger requires that all the transactions are public and transparent such that the transactions information is recorded on the chain, which may easily cause the privacy disclosure and other problems. Therefore, in order to preserve users' privacy, the transaction amount should be hidden. The common method is homomorphic commitment. When verifying the legitimacy of a transaction, using the range proof protocol to verify that the transaction amount is non-negative. This paper studied and summarized the range proof protocol based on zero-knowledge proof. We discussed the definition of range proof, the research results, the classification of algorithm, the security and efficiency for each algorithm. This paper discussed further directions for the future research.

关键词： Blockchain Privacy Bitcoin Cryptographic protocols

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