The Engine of India's Digital Economy
From street vendors to e-commerce giants, digital payments are the lifeblood of India's modern economy. The Unified Payments Interface (UPI) has revolutionised how Indians transact, with transaction volumes hitting a record 24.51 billion in August 2026
alone. This network, which processed nearly ₹30 lakh crore in a single month, is more than just a convenience; it is critical national infrastructure. The security of this system is built on modern cryptography, a set of mathematical rules that protect data, verify identities, and ensure that when you send money, it goes to the right person without anyone snooping in between. This digital trust is based on mathematical problems that are currently too hard for even the most powerful supercomputers to solve.
A Looming Quantum Threat
The foundational security of today's internet, including financial systems, relies on public-key encryption algorithms like RSA and ECC. These methods are secure because they are based on the extreme difficulty of factoring very large numbers. While a classical computer would take an impractically long time to break this encryption, a sufficiently powerful quantum computer could do it with alarming speed. This isn't a far-off science fiction concept. While we are not there yet, the threat is serious enough that experts are concerned about "harvest now, decrypt later" attacks. This is where malicious actors capture and store today's encrypted financial data, waiting for the day a quantum computer is available to unlock it. For data that needs to remain secure for years, the risk begins now, not on the day a quantum computer is built.
Building a Quantum-Proof Shield
This is where quantum-safe cryptography, also known as post-quantum cryptography (PQC), comes in. PQC involves creating new encryption algorithms that are designed to be secure against attacks from both classical and quantum computers. These new methods are not based on the same mathematical problems that quantum computers can easily solve. Instead, they rely on different, more complex challenges drawn from fields like lattice-based or hash-based cryptography. The goal is to create a new generation of digital locks that even a quantum-powered master key cannot pick. The U.S. National Institute of Standards and Technology (NIST) has been leading a global effort to standardise these new algorithms, and in August 2024, it published the first final standards, including ML-KEM for encryption and ML-DSA for digital signatures.
India's Proactive Stance
India is not waiting for the threat to become a reality. Recognising the importance of its digital economy, the government has already begun taking steps. The National Quantum Mission, approved in 2023 with a budget of over ₹6,000 crore, is designed to foster indigenous quantum technologies, including secure communications. In early 2026, a Department of Science and Technology (DST) task force released a strategic roadmap for migrating the country to quantum-safe standards. The plan outlines a phased transition, calling for Critical Information Infrastructure—which includes banking and finance—to achieve quantum resiliency by 2029. The roadmap includes developing national testing and certification programs to ensure that new solutions are both secure and interoperable. This coordinated strategy aims to build a quantum-secure digital backbone suited to India's massive scale.
