Advanced Cryptographic Architecture for Blockchain Security: A Multi-Tiered Defense Framework Against Quantum and Contemporary Threats

P. M. Srinivas; K. B. Sudeepa; Ananth G. Prabhu

doi:10.48084/etasr.17591

Authors

P. M. Srinivas NMAM Institute of Technology (NMAMIT), Nitte (Deemed to be University), India | Department of Computer Science and Engineering, Sahyadri College of Engineering and Management, Mangaluru, India
K. B. Sudeepa Department of Computer Science and Engineering, NMAM Institute of Technology (NMAMIT), Nitte (Deemed to be University), India
Ananth G. Prabhu Department of Computer Science and Engineering, Sahyadri College of Engineering and Management, Mangaluru, India

Volume: 16 | Issue: 2 | Pages: 34667-34675 | April 2026 | https://doi.org/10.48084/etasr.17591

Received: 16 January 2026 | Revised: 12 February 2026, 4 March 2026, and 9 March 2026 | Accepted: 10 March 2026 | Online: 4 April 2026

Corresponding author: P. M. Srinivas

Abstract

Blockchain technology faces increasing security threats from post-quantum vulnerabilities, sophisticated cyberattacks, and fragmented cryptographic implementations. This study proposes a comprehensive multi-layer cryptographic framework that integrates Zero-Knowledge Proofs (ZKPs), Homomorphic Encryption (HE), post-quantum algorithms, threshold cryptography, and Secure Multi-Party Computation (SMPC) across data, network, consensus, and application layers to realize a defense-in-depth model. Grounded in the Confidentiality, Integrity, and Availability (CIA) triad and defense-in-depth ethics, the framework is implemented on Hyperledger Fabric v2.5.4 with modern cryptographic libraries and evaluated over 10⁵ transactions, where baseline performance (245 ± 12 ms, 1,250 tx/s) versus the full framework (2,150 ± 78 ms, 168 tx/s) quantifies the overhead of enhanced security. The work contributes a multi-tier framework, a quantum-resilient consensus with Verifiable Delay Functions (VDFs) for 51% attack detection, a standardization roadmap for cross-chain cryptographic substantiation, and practical operations in healthcare, finance, and supply chain setups. Results demonstrate strengthened confidentiality, integrity, and authentication via encrypted computation, Byzantine Fault-Tolerant (BFT) consensus, and threshold multi-signatures, with hybrid classical–Post-Quantum Cryptography (PQC) and mitigation strategies such as off-chain computation and hardware acceleration offsetting computational costs. Unlike fragmented prior efforts, this integrated, governance-elastic blueprint enables quantum-aware, multi-layer security assurance for regulated enterprises without sacrificing decentralization or scalability.

Keywords:

Byzantine fault tolerance, cryptographic interoperability, Zero-Knowledge Proofs (ZKPs), Homomorphic Encryption (HE), Post-Quantum Cryptography (PQC), threshold signatures

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