Blockchain Security Risk Assessment in Quantum Era, Migration Strategies and Proactive Defense
Yaser Baseri, Abdelhakim Hafid, Yahya Shahsavari, Dimitrios Makrakis, Hassan Khodaiemehr
TL;DR
The paper analyzes how quantum computing undermines classical blockchain cryptography and presents a structured risk assessment framework (aligned to SP 800-30) to guide a proactive, hybrid migration to quantum-resistant cryptography. It evaluates cryptographic standards, platforms, and core blockchain components under quantum threat, proposing hybrid architectures (composite and non-composite) to balance security with migration practicality. Concrete mitigations span networks, mining pools, transaction verification, smart contracts, and wallets, with platform-specific roadmaps for Bitcoin, Ethereum, Ripple, Litecoin, and Zcash, and a roadmap for post-quantum ecosystems. The work emphasizes cryptographic agility, cross-chain interoperability, and continuous monitoring as essential to maintaining security, trust, and performance in the quantum era. Overall, it offers a comprehensive, actionable framework for researchers and practitioners to navigate the transition to quantum-resilient blockchains while preserving decentralization and operational viability.
Abstract
The emergence of quantum computing presents a formidable challenge to the security of blockchain systems. Traditional cryptographic algorithms, foundational to digital signatures, message encryption, and hashing functions, become vulnerable to the immense computational power of quantum computers. This paper conducts a thorough risk assessment of transitioning to quantum-resistant blockchains, comprehensively analyzing potential threats targeting vital blockchain components: the network, mining pools, transaction verification mechanisms, smart contracts, and user wallets. By elucidating the intricate challenges and strategic considerations inherent in transitioning to quantum-resistant algorithms, the paper evaluates risks and highlights obstacles in securing blockchain components with quantum-resistant cryptography. It offers a hybrid migration strategy to facilitate a smooth transition from classical to quantum-resistant cryptography. The analysis extends to prominent blockchains such as Bitcoin, Ethereum, Ripple, Litecoin, and Zcash, assessing vulnerable components, potential impacts, and associated STRIDE threats, thereby identifying areas susceptible to quantum attacks. Beyond analysis, the paper provides actionable guidance for designing secure and resilient blockchain ecosystems in the quantum computing era. Recognizing the looming threat of quantum computers, this research advocates for a proactive transition to quantum-resistant blockchain networks. It proposes a tailored security blueprint that strategically fortifies each component against the evolving landscape of quantum-induced cyber threats. Emphasizing the critical need for blockchain stakeholders to adopt proactive measures and implement quantum-resistant solutions, the paper underscores the importance of embracing these insights to navigate the complexities of the quantum era with resilience and confidence.