@inproceedings{mehrbanZtaDrivenHierarchicalByzantine2025,

title = {Zta-Driven Hierarchical Byzantine Consensus for Scalable O-Ran Supply Chain Security},

author = {A. Mehrban and H. Moudoud and Z. A. El Houda},

url = {https://www.scopus.com/pages/publications/105037585759?origin=resultslist},

doi = {10.1109/SmartAgriSuSY68475.2025.11466868},

isbn = {979-833157801-5 (ISBN)},

year  = {2025},

date = {2025-01-01},

booktitle = {Int. Congr. Smart Agric. Sustain. Syst., SmartAgri SuSY},

publisher = {Institute of Electrical and Electronics Engineers Inc.},

abstract = {Open RAN (O-RAN) multi-vendor interoperability continues to grow at a rapid pace, bringing flexibility and innovation but also increasing the attack surface. This makes O-RAN deployments vulnerable to supply chain infiltration and firmware tampering. Blockchain has emerged as a promising solution to provide an immutable and verifiable audit trail of equipment firmware hashes from manufacturing through deployment. However, conventional blockchain designs rely on all-to-all validator communication, which introduces scalability challenges and increases verification latency. To alleviate this issue, in this paper, we propose a scalable, efficient, and lightweight blockchain-enabled consensus framework, called H-BFT, to ensure supply chain security and attestation in O-RAN environments. H-BFT consists of three modules. The first module is a hierarchical consensus and attestation module that maps ZeroTrust Architecture (ZTA) microsegments (i.e., RU/DU/CU zones, near-real-time RIC clusters, and SMO domains) to validator committees. These committees verify local attestation events and produce concise summaries. The second module is a lightweight leader checkpointing module that periodically aggregates crosssegment digests, so that only compact validations become global, reducing communication and latency overhead. The third module is a blockchain-based audit and integrity enforcement module, where segment-level contracts enforce onboarding and integrity guarantees, and a checkpoint manager maintains consistency across the entire network. © 2025 IEEE.},

note = {Journal Abbreviation: Int. Congr. Smart Agric. Sustain. Syst., SmartAgri SuSY},

keywords = {Block-chain, Blockchain, Byzantine consensus, Firmware, Hierarchical Byzantine consensus, Multi-vendor, Network architecture, Network security, Open RAN, Open RAN (O-RAN), Permissioned blockchain, Supply chain security, Supply chains, Supply-chain attestation, Vendor interoperability, Zero-trust architecture, Zero-Trust Architecture (ZTA)},

pubstate = {published},

tppubtype = {inproceedings}

}