Blockchain Technology and Application. 5th CCF China Blockchain Conference, CBCC 2022 Wuxi, China, December 23–25, 2022 Proceedings

Description

Preface Organization Contents A Proxy Re-encryption Scheme of Medical Data Sharing Based on Consortium Blockchain 1 Introduction 2 Preliminary 2.1 Blockchain Technology 2.2 NTRU Encryption Algorithm 2.3 Identity-Based Proxy Re-encryption Technology 3 Security Sharing of Medical Data 3.1 Scheme System Description 3.2 Identity-Based Hierarchical Re-encryption Process 3.3 Consortium Blockchain Medical Data Sharing Process 4 Security Analysis and Performance Analysis 4.1 Security Analysis 4.2 Performance Analysis 4.3 The Proposed Solution is Compared with the Existing Work 5 Conclusion References A Leadership Transfer Algorithm for the Raft 1 Introduction 2 The Node Failure Time and the LWLR Algorithm 2.1 Raft Overview 2.2 The Node Failure Time 2.3 The LWLR Algorithm 3 The Leadership Transfer Algorithm 3.1 The Network Split Probability Model 3.2 The Leader Selection Algorithm 3.3 The Leadership Transfer Algorithm 4 Simulation and Analysis 4.1 Experimental Environment 4.2 Using the LWLR Algorithm to Predict the Node Failure Time 4.3 The Leadership Transfer Algorithm 5 Conclusion References Blockchain Multi-signature Wallet System Based on QR Code Communication 1 Introduction 2 Related Works 3 System Overview 3.1 Distributed Key Management 3.2 Private Key Share Cold Storage 3.3 Multi-party Signature Process 4 Multi-party Signature Implementation 4.1 Practicability of Multi-signature Scheme 4.2 Signature Algorithm 4.3 Homomorphic Encryption 4.4 Secret Sharing 4.5 Threshold Signature 5 Communication Mechanism of Cold Wallet 5.1 Cold Wallet Design Concept 5.2 Implementation of Cold Wallet Communication 6 Hardware Design of Cold Wallet 7 Hardware Design of Cold Wallet 7.1 Common Attacks on Hardware Wallets 7.2 Anti-interference QR Code Communication 7.3 Defense Against Electromagnetic Side-Channel Attacks 8 Communication Efficiency of Cold Wallet 8.1 Comparison of Coding Efficiency 8.2 Optimization of Communication Process 8.3 Efficiency of Signature Calculation Program 9 Conclusion References EthMB+: A Tamper-Proof Data Query Model Based on B+ Tree and Merkle Tree 1 Introduction 2 Preliminaries 2.1 Ethereum 2.2 Blockchain Organization 3 EthMB+ Description 3.1 MB+ Tree 3.2 Blockchain Data Extraction and Insertion 3.3 Blockchain Data Query 4 Implementation and Evaluation 4.1 Storage Usage 4.2 Insertion Performance 4.3 Query Performance 5 Conclusion References Overview of Zero-Knowledge Proof and Its Applications in Blockchain 1 Introduction 2 First Zero-Knowledge Proofs 2.1 Interactive Zero-Knowledge Proofs 2.2 Non-interactive Zero-Knowledge Proofs 3 Zk-SNARKs Based on CRS 4 Universal Updatable zk-SNARK 5 Transparent zk-SNARK 6 MPC-in-the-Head 7 Applications in Blockchain 7.1 Privacy Protection 7.2 Expansion 7.3 Applications 8 Trends and Outlook 9 Conclusion References PCT: A Relay-Based Privacy-Preserving Cross-Chain Transaction Scheme 1 Introduction 2 Preliminaries 2.1 Cross-Chain Technology 2.2 Pedersen Commitment 2.3 Ring Signature 3 System Architecture and Models 3.1 System Roles 3.2 Transaction Models 4 Privacy-Preserving Cross-Chain Transaction Scheme (PCT) 4.1 Cross-Chain Transaction 4.2 Lending Transaction 5 Security Analysis 5.1 Anonymity 5.2 Confidentiality 5.3 Reliability 6 Experiments 6.1 The Performance of Commitment Range Proof 6.2 The Performance of Transaction Generation and Verification 7 Conclusion References An Illegal Data Supervision Scheme for the Consortium Blockchain 1 Introduction 2 Related Works 3 System Model and Design Goals 3.1 System Model 4 Proposed Illegal Data Supervision Scheme 4.1 Blocking Method Based on Regular Expression 4.2 Lightweight Transaction Mark Blocking Method 5 Analysis and Comparison 5.1 Security Analysis 5.2 Theoretical Analysis 5.3 Experiment Analysis 6 Conclusion References Author Index