Clearing and settlement systems are the hidden core of global finance. They make sure trades are finalized, payments are delivered, and counterparty risk is controlled between large institutions. As quantum computing develops, these systems face new cybersecurity risks, especially against the cryptography that protects messages, keys, and digital signatures. In this project, I develop a resilience analysis framework for clearing and settlement systems under quantum-enabled attack scenarios. The framework maps technical components, operational dependencies, and cryptographic touchpoints, and then studies how quantum attacks—such as harvest-now-decrypt-later strategies, breaking public-key schemes, or tampering with validation messages—could spread through the system. Using ideas from financial market infrastructure regulation and quantum security research, I identify pressure points where cryptographic failure could trigger liquidity shocks or settlement delays. Based on these findings, I outline a layered defence model that combines post-quantum cryptography, cryptographic agility, real-time monitoring, and strong governance and incident-response planning. The main goal is to keep transaction finality, data integrity, and market stability even when quantum-capable attackers appear. The project offers practical guidance for central banks, clearing houses, and payment processors preparing for a quantum-resilient financial ecosystem.
Clearing and settlement systems are the hidden core of global finance. They make sure trades are finalized, payments are delivered, and counterparty risk is controlled between large institutions. As quantum computing develops, these systems face new cybersecurity risks, especially against the cryptography that protects messages, keys, and digital signatures. In this project, I develop a resilience analysis framework for clearing and settlement systems under quantum-enabled attack scenarios. The framework maps technical components, operational dependencies, and cryptographic touchpoints, and then studies how quantum attacks—such as harvest-now-decrypt-later strategies, breaking public-key schemes, or tampering with validation messages—could spread through the system. Using ideas from financial market infrastructure regulation and quantum security research, I identify pressure points where cryptographic failure could trigger liquidity shocks or settlement delays. Based on these findings, I outline a layered defence model that combines post-quantum cryptography, cryptographic agility, real-time monitoring, and strong governance and incident-response planning. The main goal is to keep transaction finality, data integrity, and market stability even when quantum-capable attackers appear. The project offers practical guidance for central banks, clearing houses, and payment processors preparing for a quantum-resilient financial ecosystem.
Abstract: This study develops a public policy evaluation framework for quantum-safe cyber-defence in financial infrastructure, with emphasis on post-quantum cryptography, quantum communications and the governance of critical-sector resilience. The research addresses a strategic problem now facing central banks, payment operators, market infrastructures, commercial banks, fintech platforms and regulators: the public-key cryptographic foundations used for authentication, key establishment and digital trust will become exposed if a cryptographically relevant quantum computer emerges before high-value financial systems complete migration. The paper treats quantum risk not as a narrow algorithm replacement problem, but as a multi-layered policy challenge involving standards, operational continuity, procurement, vendor coordination, legal accountability, cyber-insurance, institutional capability and cross-border interoperability. The framework is grounded in real public evidence from standards bodies, cyber agencies and financial-system reports, including NIST post-quantum standards, NIST migration guidance, NCSC system-owner guidance, NSA post-quantum resources, BIS financial-system quantum-readiness work, BIS Project Leap and national quantum strategy evidence (NIST, 2023; NIST, 2024; BIS, 2025; OECD, 2025). The methodological contribution is a structured evaluation model that links cryptographic exposure, data longevity, systemic criticality, migration complexity and mitigation maturity into a risk-priority index. The results identify wholesale settlement, central counterparty clearing, securities settlement, cross-border financial messaging, certificate trust anchors and key-management services as the most urgent layers for cryptographic inventory, hybrid testing and staged transition. The analysis finds that post-quantum cryptography is the practical near-term route to scalable resilience, while quantum key distribution remains appropriate only for carefully bounded pilots unless cost, authentication and infrastructure dependencies are resolved. The paper concludes that quantum-safe financial infrastructure requires an integrated policy architecture built around cryptographic agility, real-time asset discovery, supervisory milestones, interoperable implementation testing, mathematically auditable decision rules and coordinated public-private transition governance. Keywords: post-quantum cryptography; quantum-safe finance; cyber-defence; financial infrastructure; public policy evaluation; quantum communications; critical infrastructure resilience; cryptographic agility; ML-KEM; ML-DSA; quantum readiness; payment systems
The advent of scalable quantum computing poses a significant threat to the cryptographic foundations of digital trade, cross-border payment systems, and global financial infrastructures. Current public-key cryptosystems—widely used in digital transactions, payment authorization, and inter-bank messaging—are vulnerable to quantum-based attacks such as those enabled by Shor’s algorithm. This review analyzes the emerging domain of post-quantum cryptography (PQC) and quantum-resilient protocol design within the context of international trade and payment gateways. Key themes include the migration of legacy payment and settlement protocols to quantum-resistant formats, the integration of lattice-based key encapsulation mechanisms, stateless hash-based digital signatures, and hybrid classical–quantum key distribution (QKD) within financial messaging standards, as well as system-level design considerations for trade platforms that emphasize forward secrecy, long-term data confidentiality, and regulatory compliance across jurisdictions. By synthesizing standardization efforts and industry transition case studies, this paper offers a roadmap for financial institutions, technology vendors, and regulatory bodies to orchestrate a coordinated shift toward quantum-safe digital trade ecosystems.
This study examines the convergence of rapid Central Bank Digital Currency adoption and the growing threat that quantum computing poses to existing cryptographic systems. As digital sovereign currencies expand globally, with many economies actively exploring or piloting CBDCs, the vulnerability of classical public key cryptography to quantum attacks creates an urgent need for quantum resistant solutions. The research responds to this challenge by developing an evaluation framework focused on secure and interoperable cross border CBDC systems in a post quantum environment. Using desk based computational analysis and simulation methods suitable for remote researchers, the study evaluates lattice based algorithms standardized by the National Institute of Standards and Technology, specifically ML KEM for key encapsulation and ML DSA for digital signatures. The analysis confirms strong quantum resistance against known quantum algorithms, effectively removing harvest now decrypt later risks for future transactions. Interoperability assessments show that ISO 20022 with cryptographic abstraction is well suited for retail CBDC systems, while bridge based architectures such as BIS mBridge are more effective for wholesale settlements. Performance testing on thousands of simulated transactions indicates that post quantum protocols are feasible for wholesale use but introduce significant computational and bandwidth overheads that limit immediate retail scalability without hardware acceleration. Overall, the findings support a phased migration strategy that combines classical and post quantum cryptography in the near term, guided by cryptographic agility. The study provides practical insights for central banks seeking to balance security, efficiency, and cross border compatibility in an evolving quantum threat landscape.
The rapid evolution of quantum computing presents a new age of paradigm shift in cybersecurity and particularly to financial institutions, which heavily rely on the use of encryption to keep their sensitive data confidential. The traditional cryptographic designs, such as RSA and ECC, are becoming more vulnerable to quantum attacks, which also include a requirement to design quantum-resistant cryptographic designs. This paper discusses quantum resistant cryptography systems to be implemented into the future of the financial cybersecurity setting, potential applications of cryptosecurity to finances, data protection systems, digital transactions security, and encryption and authentication systems. We suggest a hybrid cryptography system which is a combination of lattice-based encryption, hash-based signatures, post-quantum key exchange systems to enable it to be more resilient to quantum attacks. It also has risk-aware authentication and multi-layered encryption solutions which are integrated into the framework based on the requirement of financial institutions in its operation. To test the framework, we modeled the digital transaction case through the application of representative financial data and quantified the key performance indicators to include encryption/decryption time, the transaction time, and the resistance to attacks. The results confirm the fact that the security measures have considerably increased and the quantum-resilient protocols possess the same stage of computing power as a classical system and decrease risks stemming out of quantum-enabled adversary. The quantitative findings have shown that the likelihood of possible breaches is now minimized by 78 percent, confidentiality of transactions is enhanced, and dependability of authentication with different threat models. The work provides a feasibility guide on the application of quantum resistant protocols in financial systems that could be utilized to provide scalability with regard to securing of digital transactions and risk management. The findings emphasize the need to deploy quantum-resilient cryptography by financial institutions, which would experience sustainable cybersecurity in the new age of quantum computing.
This study examines the convergence of rapid Central Bank Digital Currency adoption and the growing threat that quantum computing poses to existing cryptographic systems. As digital sovereign currencies expand globally, with many economies actively exploring or piloting CBDCs, the vulnerability of classical public key cryptography to quantum attacks creates an urgent need for quantum resistant solutions. The research responds to this challenge by developing an evaluation framework focused on secure and interoperable cross border CBDC systems in a post quantum environment. Using desk based computational analysis and simulation methods suitable for remote researchers, the study evaluates lattice based algorithms standardized by the National Institute of Standards and Technology, specifically ML KEM for key encapsulation and ML DSA for digital signatures. The analysis confirms strong quantum resistance against known quantum algorithms, effectively removing harvest now decrypt later risks for future transactions. Interoperability assessments show that ISO 20022 with cryptographic abstraction is well suited for retail CBDC systems, while bridge based architectures such as BIS mBridge are more effective for wholesale settlements. Performance testing on thousands of simulated transactions indicates that post quantum protocols are feasible for wholesale use but introduce significant computational and bandwidth overheads that limit immediate retail scalability without hardware acceleration. Overall, the findings support a phased migration strategy that combines classical and post quantum cryptography in the near term, guided by cryptographic agility. The study provides practical insights for central banks seeking to balance security, efficiency, and cross border compatibility in an evolving quantum threat landscape.
The accelerating adoption of quantum computing poses both unprecedented opportunities and systemic risks for global financial systems. While quantum algorithms promise breakthroughs in portfolio optimization, risk modeling, and economic forecasting, the potential compromise of classical cryptographic infrastructures threatens the confidentiality, integrity, and stability of digital financial ecosystems. This study examines the interplay between quantum-resilient cryptography and macro-financial stability, proposing a dual-layer security-economic framework to guide the transition toward post-quantum financial architectures. We evaluate leading post-quantum cryptographic (PQC) standards—including lattice-based, hash-based, and code-based schemes—and assess their performance within high-frequency trading networks, interbank settlement systems, and blockchain-enabled financial platforms. Simulation-based analyses demonstrate that PQC integration introduces measurable computational overheads but significantly strengthens resistance against quantum-enabled cyberattacks, thereby mitigating systemic vulnerabilities that could cascade across financial markets. Our findings highlight that timely migration to quantum-safe cryptography is essential for preserving economic stability, protecting financial institutions from existential cyber risks, and ensuring the long-term resilience of digital economies in the quantum era.