The banking sector remains a high-value target for cyberattacks due to its vital role in managing sensitive financial data and enabling large-scale digital transactions. As digital banking expands, cyber risks increasingly carry systemic implications. In this context, quantum computing represents a fundamental shift in the cybersecurity landscape. Widely used encryption mechanisms such as RSA and elliptic curve cryptography (ECC), which underpin digital banking, payments, and data protection, are vulnerable to future quantum attacks particularly under the "harvest now, decrypt later" (HNDL) threat model, where encrypted financial data collected today may be compromised once quantum computing capabilities mature. This research examines the role of quantum computing in reshaping banking cybersecurity, with emphasis on post-quantum cryptography (PQC), quantum key distribution (QKD), quantum random number generation (QRNG), and quantum machine learning (QML) for fraud detection. Drawing on global and Indian banking practices, regulatory guidance from RBI and SEBI, and policy initiatives such as India's National Quantum Mission, the study proposes a structured roadmap for quantum readiness. The NIST finalization of PQC standards (FIPS 203–205, August 2024) has removed a key barrier to action, enabling banks to begin quantum-safe migration immediately. The study concludes that quantum-safe migration is a strategic imperative requiring phased implementation, architectural modernization, and coordinated regulatory and institutional action
Abstract: As digital payments become the backbone of economies in South Asia, quantum computing threatens to break the cryptography that secures modern financial systems. This paper explains in straightforward terms how cryptography ensures trust in digital payments, and why emerging quantum technologies could render widely used encryption methods such as RSA and ECC vulnerable. It explores the concept of "quantum risk," showing how payment systems require urgent upgrades to prevent future breaches. Focusing on developments in India, the paper reviews the country's regulatory structure, technical innovations, and efforts to build quantum-safe digital infrastructure. It assesses India’s preparations in comparison to the FATF guidelines and international best practices, comparing the nation’s roadmap with steps already taken by global leaders, including China, the EU, and Singapore. The study highlights the progress made in India and also points out critical challenges in regulation, talent, cost, and cross-border interoperability. A practical set of recommendations is provided for India’s path forward, including cryptographic agility, mandatory RBI standards for quantum-safe algorithms, deeper collaboration between government, fin-techs, and academic institutions, & strict alignment with NIST and ISO global standards. The paper emphasizes that India, with its active fintech sector and huge transaction volumes, must accelerate its quantum-proof encryption transition to safeguard consumer trust and financial stability, and sets out clear steps for policymakers and industry to future-proof the payment ecosystem in the coming quantum era. Keywords: Quantum Computing, Quantum Threats, Quantum-Safe Cryptography, Post-Quantum Cryptography (PQC), Digital Payments JEL Classification Number: O33, K39
The rise of quantum computing introduces a profound threat to existing digital security frameworks, particularly those that underpin modern payment systems. Current cryptographic standards, such as RSA, ECC, and ECDSA are susceptible to being broken by quantum algorithms like Shor's and Grover's, jeopardizing the confidentiality, authenticity, and integrity of transactions across financial networks. This study presents a comprehensive investigation into the design, feasibility, and architecture of a universal quantum-safe payment platform capable of processing all types of digital transactions, ranging from mobile money and bank transfers to blockchain-based and card payments through existing delivery channels on a decentralized infrastructure. The research synthesizes current developments in post-quantum cryptography (PQC), including lattice-based, hash-based, and code-based algorithms, and evaluates their suitability for real-time financial systems. The proposed platform incorporates a permissioned distributed ledger, API-level compatibility with legacy financial protocols, and an identity-governed, modular architecture that enables cryptographic agility and policy compliance. Through architectural modeling and critical analysis, this research provides a forward-looking blueprint for building quantum-resilient financial infrastructure. It concludes that while performance and governance hurdles remain, quantum-safe payment networks are both technically feasible and urgently necessary. This work aims to equip stakeholders, especially fintech firms, banks, and regulatory bodies, with a detailed roadmap for transitioning to secure, interoperable, and scalable payment systems in the quantum era.