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Practical and Secure Keyword Search Services on Blockchain

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thesis
posted on 2025-04-13, 12:20 authored by Jun Zhao
This thesis investigates the challenges and solutions in developing blockchain-based searchable encryption systems, with a focus on key aspects such as security, scalability, and incentives. First, this thesis introduces a novel off-chain verification method for SSE systems, addressing both dishonest server nodes and users, ensuring security and on-chain scalability. Second, it proposes a non-verification-based approach to enhance the scalability of blockchain databases, introducing a VRF-based load-balancing algorithm that improves throughput while preserving the security guarantees of blockchain technology. Third, it presents SEARCHAIN, a proof-of-useful-work blockchain system for SSE queries, which incorporates a novel committee selection algorithm to incentivise honest verification by auditors, ensuring service fairness. Through both theoretical analysis and empirical evaluation, this thesis demonstrates how these approaches enhance the security and practicality of blockchain-based SSE systems.

History

Campus location

Australia

Principal supervisor

Kai Sui Liu

Additional supervisor 1

Xingliang Yuan

Additional supervisor 2

Jiangshan Yu

Year of Award

2025

Department, School or Centre

Software Systems & Cybersecurity

Course

Doctor of Philosophy

Degree Type

DOCTORATE

Faculty

Faculty of Information Technology

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