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July 20, 2026
Sudiptaa Paul Choudhury
Quantum Readiness Assessment for Enterprises
A Quantum Readiness Assessment identifies quantum-vulnerable cryptography, including RSA, ECC and Diffie-Hellman, across enterprise systems.
It prioritises risks by evaluating data sensitivity, system criticality, third-party exposure and crypto-agility.
The assessment provides a risk-ranked, phased roadmap for migrating high-priority systems to post-quantum cryptography.
Most enterprises can tell you what firewall vendor they use. Very few can tell you how many of their certificates, keys, and encrypted connections rely on RSA or ECC, the exact algorithms a cryptographically relevant quantum computer will break. A quantum readiness assessment is the exercise that closes that gap, and in 2026 it has stopped being optional groundwork for "someday" and become the starting document every board is asking for.
This guide walks through what a quantum readiness assessment actually is, why it can't wait, and the eight-step process enterprises are using to build one properly.
A quantum readiness assessment is a structured evaluation of an organisation's exposure to quantum computing risk, specifically, how much of its infrastructure, data, and third-party ecosystem depends on cryptography that a future quantum computer could break. It combines a cryptographic inventory (where public-key encryption is used), a risk analysis (what's actually at stake if that encryption fails), and a readiness score (how easily each system could migrate to quantum-safe alternatives).
Unlike a general security audit, a quantum readiness assessment has one specific target: public-key cryptography vulnerable to Shor's algorithm, RSA, ECC, Diffie-Hellman, and ECDSA. It answers three questions a CISO needs answered before spending a single pound on remediation: what do we have, what's it protecting, and how hard will it be to fix.
The urgency isn't about quantum computers existing today, it's about harvest-now-decrypt-later (HNDL) attacks happening right now. Adversaries are already intercepting and storing encrypted traffic, banking on the ability to decrypt it once a capable quantum computer arrives. Any data with a confidentiality requirement longer than five to ten years- financial records, health data, defence communications, M&A documents, source code is exposed to this risk today, regardless of when Q-Day actually lands.
Long-lived data is the crux of the problem. A medical record or a classified defence communication doesn't stop being sensitive after a year, it needs protection for decades. If that data is encrypted with RSA-2048 today and intercepted today, it's already compromised the moment decryption becomes feasible, even if that's ten years away. Readiness assessment exists precisely to find this data before an attacker does.
Regulatory timelines are compressing the window further. NIST's transition plan deprecates RSA-2048 and ECC P-256 by 2030 and aims to remove quantum-vulnerable algorithms from its standards entirely by 2035. NSA's CNSA 2.0 mandates PQC for new national security systems by 2027. None of these deadlines are met without first knowing where your vulnerable cryptography lives, which is exactly what an assessment produces.
A credible quantum readiness assessment follows a consistent eight-step sequence. Skipping steps, particularly jumping straight to remediation before completing the inventory, is the most common reason enterprise PQC programmes stall or duplicate work later. This mirrors the process our team follows during a quantum readiness assessment engagement.
Before any scanning begins, agree what's actually in scope: which business units, applications, infrastructure, cloud environments, APIs, databases, certificate authorities, and sensitive data repositories will be assessed. Enterprises that skip this step tend to either boil the ocean (assessing everything at once, which stalls momentum) or miss entire business units that turn out to hold the most sensitive long-lived data. A tightly scoped first pass, one business unit, one data centre, one cloud environment, beats an unscoped assessment that never finishes.
Cryptographic inventory is the foundation everything else depends on. Identify every place cryptography is in use: TLS connections, VPNs, PKI, APIs, digital certificates, HSMs, key management systems, code-signing processes, applications, and third-party systems. Most organisations discover significantly more cryptographic assets than expected, certificates and keys accumulate quietly for years across teams, vendors, and forgotten legacy systems. Automated discovery tooling is strongly preferred over manual inventory at any meaningful enterprise scale.
With the inventory built, flag every instance of RSA, ECC, Diffie-Hellman, ECDSA, and other public-key cryptography that Shor's algorithm can break. This step converts a generic inventory into a quantum-specific risk map, separating what's vulnerable from what isn't, since symmetric algorithms like AES-256 remain quantum-resistant and don't need the same urgency.
Cross-reference the vulnerable algorithms against the data they protect, and specifically flag anything that must stay confidential for years: financial records, healthcare data, defence communications, customer data, intellectual property, and legal documentation. This is where harvest-now-decrypt-later risk becomes concrete, a vulnerable algorithm protecting data with a two-year shelf life is a lower priority than the same algorithm protecting a twenty-year state secret or a patient's genomic record.
Your own infrastructure is only part of the picture. Review cloud providers, SaaS tools, certificate authorities, HSM vendors, network vendors, and security platforms for their PQC or crypto-agility readiness. A perfectly migrated internal environment is still exposed if your certificate authority, payment processor, or core SaaS vendor hasn't started its own transition, third-party dependency is consistently one of the most underestimated risk categories in enterprise assessments.
Check whether algorithms, keys, certificates, and protocols across each system can be replaced without a major application or infrastructure redesign. Systems built with hard-coded cryptographic assumptions will need far more time and budget to migrate than systems built with an abstracted, swappable cryptographic layer. This step effectively predicts how expensive and how slow each future migration will be.
Use Post-Quantum Crypto-Agility Risk Assessment to evaluate your readiness.
Bring everything together into a prioritised risk score for each system, based on algorithm exposure, data sensitivity, business criticality, external exposure, and migration complexity. This scoring is what turns a long, undifferentiated list of vulnerable systems into an actionable sequence, telling leadership exactly which ten systems matter most, rather than presenting an overwhelming inventory with no clear starting point.
Convert the assessment findings into a phased PQC migration roadmap, highest-risk systems first, third-party dependencies tracked separately, and crypto-agility built into every new procurement and development project going forward so the debt stops growing while you pay down what already exists.
A properly run assessment should hand leadership five concrete deliverables: A complete cryptographic inventory, a list of vulnerable algorithms by system, a quantum risk register ranking exposure across the estate, a high-risk system list prioritised for action, a vendor and third-party dependency map, and a phased migration roadmap tied to business risk rather than generic timelines. If any of these five is missing, the assessment isn't finished, it's a partial audit dressed up as a strategy document.
Use this as a quick gut-check before commissioning or reviewing an assessment:
· Scope agreed across business units, cloud environments, and data domains
· Cryptographic inventory covers TLS, VPNs, PKI, APIs, certificates, HSMs, KMS, and code signing
· Vulnerable algorithms (RSA, ECC, Diffie-Hellman, ECDSA) explicitly flagged, not just "encryption in general"
· Long-lived, sensitive data cross-referenced against vulnerable systems
· Third-party and vendor readiness reviewed, not assumed
· Crypto-agility evaluated system by system, not treated as a single yes/no
· Risk-scored, prioritised system list produced, not just a raw inventory
· Phased migration roadmap delivered with named owners and timelines
QNu Labs is the world's only full-stack quantum cybersecurity company, and quantum readiness assessment is the starting point of every engagement we run. Our team combines cryptographic discovery, quantum risk scoring, and crypto-agility evaluation with our quantum security platform to give enterprises a single, prioritised view of their exposure, rather than a static spreadsheet that's outdated within months. Backed by India's National Quantum Mission and incubated at IIT Madras Research Park, we work with organisations across banking, defence, telecom, and healthcare to turn assessment findings into a Quantum Safe Key Lifecycle Management System (QKMS) deployment that actually closes the gaps we find.
A quantum readiness assessment isn't a compliance checkbox, it's the only way to find out, with evidence rather than assumption, whether your organisation's most sensitive long-lived data is already exposed to harvest-now-decrypt-later attacks. The enterprises moving methodically through this process now will migrate on their own timeline and budget. The ones that wait will migrate on an attacker's timeline instead.