Title: Privacy and security protection of blockchain data sharing based on PoDaS algorithm

Authors: Huamin Liu; Yu Li; Lei Lu

Addresses: Information Engineering College, Ganzhou Polytechnic, Ganzhou, 341000, China ' Public Basics Department, Ganzhou Polytechnic, Ganzhou, 341000, China ' Information Engineering College, Jiangxi College of Applied Technology, Ganzhou, 341000, China

Abstract: This study proposes a blockchain-based privacy and security protection method for efficient data sharing. To address challenges like high computational overhead, a hybrid consensus algorithm, PoDaS (combining proof-of-work and proof-of-stake), is introduced and further enhanced with a reputation mechanism. Experimental results show the system maintains high performance, with block generation times between 100-180ms and stable operation even with 40% malicious nodes. The method achieves consistent throughput of 20,000 transactions per second and millisecond-level latency, maintaining 150-200ms latency when block time is set to 25s. It also attains a 97.15% accuracy rate, outperforming existing improved proof-of-stake algorithms. These results demonstrate that the proposed approach ensures robust privacy and security while enhancing efficiency and user trust in blockchain-based systems.

Keywords: PoDaS algorithm; blockchain; data sharing; privacy and security; consensus mechanism.

DOI: 10.1504/IJICS.2026.153349

International Journal of Information and Computer Security, 2026 Vol.29 No.4, pp.468 - 486

Received: 16 Jul 2025
Accepted: 15 Nov 2025
Published online: 01 May 2026 *

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