Somewhere inside your core banking stack exists a certificate, a key or an encryption library that nobody has touched in years. It still works, so nobody questions it. That exact quiet assumption is what a quantum-capable attacker is counting on. Data that is encrypted today with RSA or ECC can be captured now and decrypted later, once quantum computers catch up – a tactic security teams call harvest now, decrypt later.
That single risk is behind most of the post-quantum readiness concerns security leaders raise today. India’s Department of Science and Technology released its National Quantum Mission task force report in Feb 2026, recommending that critical and financial infrastructure begin formal post-quantum cryptography (PQC) implementation by 2027. This blog walks through what is driving these concerns and a structured way to work through them.
What is driving concern around post-quantum readiness right now?
Quantum computing has not yet broken today’s encryption but attackers do not need a working quantum computer today. They only need to store encrypted data now and wait.
For Indian BFSI, the exposure runs deep. Core banking systems, KYC archives, interbank settlement and SWIFT messaging all depend on RSA or ECC at multiple layers, often across decades-old infrastructure. A 2026 Hybrid Cloud Security Survey by Gigamon found that 88 percent of financial services organisations already cite harvest now, decrypt later as a major problem, with 93 percent saying visibility into encrypted traffic is critical to post-quantum readiness.
5 concerns slowing post-quantum readiness in Indian BFSI
Most of these concerns fall into a handful of recurring patterns. Naming them clearly is the first step toward a plan.
- No cryptographic inventory: Security teams cannot say with confidence where every key, certificate and algorithm lives across code, cloud and hardware security modules.
- Harvest now, decrypt later exposure: Long-lived data such as KYC records, contracts and payment history stays valuable to attackers for years after it is stolen.
- Legacy and fragmented systems: Public sector banks and large enterprises run core systems built over decades, often with multiple hardware security modules and key stores across business units.
- Regulatory uncertainty: RBI has not yet issued an explicit PQC migration mandate, even as SEBI’s CSCRF and the DST Task Force move toward firmer timelines and CBOM requirements.
- Budget & talent constraints: Companies focus more on immediate cyber threats over long-term quantum preparation. When this is combined with limited in-house expertise, it leads to delays in planning and adoption of quantum-resistant cryptography.
Why these concerns are sharper for Indian BFSI
India’s regulatory picture is moving fast, even without a single unified deadline yet. SEBI’s CSCRF already encourages regulated entities to inventory cryptographic assets and prioritise post-quantum migration by risk. The DST Task Force report recommends introducing PQC readiness requirements in procurement, including phased adoption of CBOMs and vendor CBOM submissions beginning from FY 2027–28.
RBI-regulated institutions should plan on two assumptions: supervisory expectations will tighten within the next few regulatory cycles, and institutions that show early, structured progress will fare better at examination than those waiting for an explicit mandate.
How to build post-quantum readiness with a structured plan
A defensible plan does not require solving everything at once. It requires sequencing the work correctly.
- Discover: Build a complete cryptographic inventory across applications, cloud, HSMs and third-party integrations.
- Prioritise: Rank systems by data sensitivity and harvest now, decrypt later exposure, not just technical complexity.
- Pilot: Test hybrid PQC and classical cryptography in non-production environments before wider rollout.
- Govern: Build crypto-agility into procurement and architecture so algorithms can be swapped without rebuilding systems.
Conclusion
These concerns are not a future problem for Indian BFSI. Broken systems, harvest now decrypt later exposure and tightening frameworks from SEBI, RBI and the DST Task Force all point the same way: institutions that build a cryptographic inventory now will migrate on their own timeline, not a regulator’s.
CyberNX’s NXRADAR platform helps you address post-quantum readiness concerns with continuous cryptographic discovery across code, cloud and HSMs, mapped to India’s growing compliance requirements. Connect with our experts to check out our CBOM solutions and see where your institution stands today.
Post-Quantum Readiness Concerns FAQs
What are the biggest concerns for post-quantum readiness at Indian banks?
Fragmented legacy systems, unclear regulatory timelines and limited visibility into where cryptography lives across the estate are the concerns raised most often by Indian BFSI security teams.
Has RBI mandated post-quantum cryptography migration?
Not yet as an explicit standalone mandate, though RBI’s existing cybersecurity frameworks and India’s DST Task Force roadmap both point toward tightening supervisory expectations within the next few regulatory cycles.
What is harvest now, decrypt later?
It is a tactic where attackers collect encrypted data today and store it, planning to decrypt it once quantum computers become capable enough. Long-lived records such as KYC data are more exposed.
Where should organisations start with post-quantum readiness?
Start with a complete cryptographic inventory. You cannot prioritise or migrate what you have not first discovered and mapped to business risk.
