Blockchain Technology and Emerging Technologies: Second EAI International Conference, BlockTEA 2022, Virtual Event, November 21-22, 2022, Proceedings

Preface
Organization
Contents
Smart Contract
ID-Based Self-encryption via Hyperledger Fabric Based Smart Contract
	1 Introduction
	2 State of the Art
	3 Background
	4 ID-Based Self-encryption
		4.1 Integrating Identity into the Encryption
		4.2 Connecting the Encryption Algorithm and the Local Application
		4.3 Smart Contract
		4.4 Self-encryption Work Flow in a Blockchain-IPFS Based Network
	5 Results
		5.1 Performance Analysis
		5.2 Benefits Overview
	6 Discussion
	7 Conclusion
	References
Scalable Smart Contracts for Linear Regression Algorithm
	1 Introduction and Motivation
	2 Problem Definition
	3 Our Contribution
	4 Literature Review
	5 Methodology
	6 Experimental Setup
	7 Performance Evaluation
	8 Computational Analysis
	9 Limitation and Challenges
	10 Conclusion
	References
Combining ID's, Attributes, and Policies in Hyperledger Fabric
	1 Introduction
	2 Related Work
	3 Contribution
	4 Background
		4.1 Hyperledger Fabric
		4.2 Secure Access Control
		4.3 Certificate Authorities (CAs)
		4.4 Membership Service Providers (MSPs)
		4.5 Generating Certificates
	5 Proposed Implementation
		5.1 Combining Attributes
		5.2 Combining Policies
		5.3 Combining ID's
		5.4 Workflow in a Blockchain-IPFS-Based Network
	6 Results
	7 Discussion
	8 Conclusions
	References
A Secure Microgrid Power Transaction Scheme Based on Hyperledger Fabric
	1 Introduction
		1.1 Related Works
		1.2 Contribution
	2 Preliminary
		2.1 Hyperledger Fabric
		2.2 Blockchain Oracle
		2.3 Proof of Work
	3 Smart Microgrid Power Trading System Based on Consortium Blockchain
		3.1 User and Node Definitions
		3.2 Smart Contract and Blockchain Oracle Design
		3.3 PCDA Algorithm
	4 Distributed Power Transaction Process
		4.1 Publish Bid Order
		4.2 Bid Matching and Contract Signing
		4.3 Transaction Settlement
	5 System Analysis
		5.1 System Security Analysis
		5.2 System Feasibility Analysis
	6 Conclusions
	References
Privacy Protection
An Outsourced Multi-authority Attribute-Based Encryption for Privacy Protection with Dynamicity and Audit
	1 Introduction
		1.1 Our Contribution
		1.2 Paper Organization
	2 Related Work
	3 Preliminaries
		3.1 Access Structures
		3.2 Lagrange Interpolation
		3.3 Bilinear Pairings
		3.4 The Decisional Bilinear Diffie-Hellman Problem (DBDH)
		3.5 Trapdoor Function
	4 Syntax and Security
		4.1 Security Assumptions
		4.2 Security Model
	5 Our Construction
		5.1 System Initialization
		5.2 Execution
		5.3 Encryption and Decryption
		5.4 Audit
		5.5 Decryption by User
	6 Security Analysis
	7 Comparisons
		7.1 Feature and Security Comparisons
		7.2 Computational Analysis
		7.3 Storage Overhead
	8 Conclusion
	References
A Privacy-Preserving and Auditable Scheme for Interfacing Public Blockchain with Consortium Blockchain
	1 Introduction
		1.1 Related Work
		1.2 Our Contribution: Cross-Chain with Privacy and Auditability
	2 Preliminaries
		2.1 Mathematical Backgrounds
		2.2 Threshold Signature
	3 System Model
		3.1 System Architecture
		3.2 Threats
	4 Our Proposed Scheme
		4.1 Overview
		4.2 Detailed Description
		4.3 Security Discussion
	5 Conclusion
	References
Data Cooperatives for Trusted News Sharing in Social Media
	1 Introduction and Problem Motivation
		1.1 Data Cooperatives
		1.2 Fake News
		1.3 Why Blockchain for Data Cooperatives?
		1.4 Our Contributions
		1.5 Outline
	2 Background and Related Work
	3 System Architecture
		3.1 Participants and Their Roles on the Blockchain
		3.2 Smart Contract
		3.3 Event Flows
		3.4 Reputation System
		3.5 Incentive Structure
	4 Experimental Setup and Implementation
	5 Results and Discussion
		5.1 Security Analysis
	6 Conclusion and Future Work
	References
NFT and Machine Learning
A Novel Fast Recovery Method for HT Tamper in Embedded Processor
	1 Introduction
	2 The Proposed Recovery Method
		2.1 The Design and Implement of GPRs Backup Unit
		2.2 The Design and Implement of PC Rollback Unit
	3 Experimental Results
	4 Conclusion
	References
MIA-Leak: Exploring Membership Inference Attacks in Federated Learning Systems
	1 Introduction
	2 Related Work
		2.1 Attacks in Federated Learning
		2.2 Membership Inference
		2.3 Defense Proposals
	3 Membership Inference Attacks in Federated Learning
		3.1 Threat Models
		3.2 Case1: Class-Level Attack
		3.3 Case2: User-Level Attack
	4 Experimental Evaluation
		4.1 Datasets and Experimental Setup
		4.2 Effectiveness of Data Augmentation
		4.3 Evaluation of Class-Level Attack
		4.4 Evaluation of User-Level Attack
	5 Summary and Future Work
	References
SoK: Can NFTs Solve the Economic Problems of Countries with Ancient Heritage? Egypt as a Case Study
	1 Countries and Cryptocurrencies
	2 Countries and NFTs
	3 NFTs Profitable Uses
	4 The Egyptian Case
	5 Issues, Challenges, and Design Decisions
	6 NFTs.. The Concept, and Technical Details
		6.1 The Conceptual Meaning of an NFT
		6.2 Implementing NFTs in Different Smart Contract Blockchains
		6.3 Implementing NFTs in Bitcoin
	7 Conclusions and Prospectives
	Appendix A
	References
Author Index