Open Access

REVIEW

Security and Privacy in Permissioned Blockchain Interoperability: A Systematic Review

Alsoudi Dua¹, Tan Fong Ang¹, Chin Soon Ku^2,*, Okmi Mohammed^1,3, Yu Luo⁴, Jiahui Chen⁴, Uzair Aslam Bhatti⁵, Lip Yee Por^1,*

1 Center of Research for Cyber Security and Network (CSNET), Faculty of Computer Science and Information Technology, Universiti Malaya, Kuala Lumpur, 50603, Malaysia
2 Department of Computer Science, Universiti Tunku Abdul Rahman, Kampar, 31900, Malaysia
3 Department of Information Technology and Security, Jazan University, Jizan, 45142, Saudi Arabia
4 School of Computer Science and Technology, Guangdong University of Technology, Guangzhou, 510006, China
5 School of Information and Communication Engineering, Hainan University, Haikou, 570228, China

* Corresponding Authors: Chin Soon Ku. Email: ; Lip Yee Por. Email:

(This article belongs to the Special Issue: Advancing Network Intelligence: Communication, Sensing and Computation)

Computers, Materials & Continua 2025, 85(2), 2579-2624. https://doi.org/10.32604/cmc.2025.070413

Received 15 July 2025; Accepted 19 August 2025; Issue published 23 September 2025

Abstract

Blockchain interoperability enables seamless communication and asset transfer across isolated permissioned blockchain systems, but it introduces significant security and privacy vulnerabilities. This review aims to systematically assess the security and privacy landscape of interoperability protocols for permissioned blockchains, identifying key properties, attack vectors, and countermeasures. Using PRISMA 2020 guidelines, we analysed 56 peer-reviewed studies published between 2020 and 2025, retrieved from Scopus, ScienceDirect, Web of Science, and IEEE Xplore. The review focused on interoperability protocols for permissioned blockchains with security and privacy analyses, including only English-language journal articles and conference proceedings. Risk of bias in the included studies was assessed using the MMAT. Methods for presenting and synthesizing results included descriptive analysis, bibliometric analysis, and content analysis, with findings organized into tables, charts, and comparative summaries. The review classifies interoperability protocols into relay, sidechain, notary scheme, HTLC, and hybrid types and identifies 18 security and privacy properties along with 31 known attack types. Relay-based protocols showed the broadest security coverage, while HTLC and notary schemes demonstrated significant security gaps. Notably, 93% of studies examined fewer than four properties or attack types, indicating a fragmented research landscape. The review identifies underexplored areas such as ACID properties, decentralization, and cross-chain attack resilience. It further highlights effective countermeasures, including cryptographic techniques, trusted execution environments, zero-knowledge proofs, and decentralized identity schemes. The findings suggest that despite growing adoption, current interoperability protocols lack comprehensive security evaluations. More holistic research is needed to ensure the resilience, trustworthiness, and scalability of cross-chain operations in permissioned blockchain ecosystems.

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Supplementary Material

Supplementary Material File

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