Post-Quantum Cryptography Is Already Urgent — and Most Organizations Are Dangerously Unprepared

Your organization's encrypted data may already be sitting in an adversary's archive. The quantum computer needed to unlock it does not exist yet — but the clock is running.

Writing for SecureWorld on July 20, 2026, cybersecurity expert Neha Srivastava issued a sharp warning to security leaders: post-quantum cryptography (PQC) is not a problem for 2035. It is a problem for right now. The article — the first in a multi-part series — challenges the widespread assumption that organizations can afford to wait until quantum computers become commercially viable before beginning their cryptographic migration. That assumption, Srivastava argues, may already be costing them more than they realize.

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The Threat That Does Not Need a Quantum Computer to Work

The most immediate danger does not require a functioning quantum computer at all. It requires only a patient attacker.

The strategy is known as Harvest Now, Decrypt Later (HNDL). Nation-state adversaries and sophisticated threat actors are already intercepting and storing encrypted communications today. They cannot read the data yet. But they are betting that once a cryptographically relevant quantum computer becomes available, the stored data becomes retroactively readable — and everything inside it is exposed.

"You don't need a working quantum computer to be at risk today," Srivastava wrote. "You need an attacker willing to wait."

The implications are significant for any organization holding long-shelf-life sensitive data. Government records, defense communications, patient health data, financial records, intellectual property, and critical infrastructure designs are all potential targets. Understanding the different types of encryption and how they work is essential context here — because if that data was encrypted using today's standard public-key algorithms — RSA or elliptic curve cryptography — it may already be sitting in an adversary's archive. There is no patch for that once a quantum computer arrives.

Beyond HNDL, Srivastava highlights a second major threat: digital signature forgery. Quantum computers powerful enough to break current public-key algorithms could allow attackers to forge identities, impersonate trusted entities, sign malicious software, and undermine the authentication systems that modern commerce and government depend on. Code signing, financial transactions, and software update pipelines could all be compromised.

Why This Threat Is Different From Others You've Prepared For

What makes HNDL particularly difficult to counter is its retroactive nature. Most cybersecurity threats operate in the present — an attacker gains access, exfiltrates data, or deploys ransomware within a defined window. Defenders can detect, respond, and recover.

HNDL breaks that model entirely. The interception has already happened. The data is already stored. The vulnerability does not surface until years later, when a sufficiently powerful quantum computer arrives — at which point there is no remediation path. No incident response plan covers a breach that occurred silently years before it was exploited. This is precisely why the organizations most at risk are often the least alarmed.

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Why Migration Cannot Wait for Certainty

The most common executive response to the quantum threat is a version of the same question: if quantum computers are not practical yet, why spend now?

Srivastava's answer is direct. Cryptographic migration is not a software patch. It is a multi-year organizational transformation — and most enterprises are carrying a level of technical complexity that makes rapid transitions impossible.

A typical large organization manages thousands of applications, millions of digital certificates, legacy industrial systems with decade-long lifecycles, connected medical devices, operational technology environments, and IoT infrastructure distributed across global supply chains. None of that gets updated overnight.

Real migration demands cryptographic discovery, dependency mapping, vendor coordination, hardware refresh cycles, compliance testing, and operational validation. Most industries should expect this process to take years. Srivastava is unambiguous: "Wait until quantum computers are commercially practical, and you've already run out of runway."

The broader case for understanding why encryption matters to your organization's security has never been more pressing — because the entire foundation of modern encryption is what the quantum transition puts at risk.

The Geopolitical Dimension Security Leaders Are Underestimating

Governments are not treating this as a distant concern. National investment in quantum-safe cryptography has accelerated globally, with defense, intelligence agencies, energy grids, financial systems, and telecommunications all identified as critical sectors. Some analysts have compared the PQC transition to the space race — a genuine geopolitical competition in which the nations and organizations that move earliest will be best positioned to defend their digital sovereignty.

The supply chain dimension compounds the urgency. A single vendor that fails to modernize its cryptographic infrastructure can introduce vulnerabilities that ripple downstream through every organization it serves. An organization that has done everything right internally can still be compromised through a supplier, a software dependency, or a third-party service that has not kept pace.

This is not a theoretical risk. It mirrors the supply chain dynamics seen in other high-profile incidents — and the cryptographic equivalent could affect entire industry sectors simultaneously.

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A Practical Roadmap for Security Leaders

Srivastava outlines a ten-step migration framework that security and executive teams can begin implementing now. The roadmap prioritizes governance, discovery, and risk classification before technical execution.

Step One: Establish Leadership Mandate and Ownership

The first step is establishing executive sponsorship and assigning clear ownership of a PQC strategy. Without a mandate from leadership, she argues, the effort will stall. Embedding PQC migration within a well-structured information security strategy is what separates organizations that make meaningful progress from those that run endless working groups without outcomes.

Step Two: Build a Complete Cryptographic Inventory

That mandate is followed by a full cryptographic inventory — identifying every instance of RSA, ECC, and other quantum-vulnerable algorithms across the enterprise and mapping how they interconnect. This step is foundational. You cannot migrate what you cannot see, and most organizations have significantly less visibility into their cryptographic estate than they assume.

Step Three: Classify Data and Prioritize Migration Risk

From there, organizations should classify data by sensitivity and flag assets most exposed to HNDL risk. High-priority systems migrate first. Long-lived sensitive data — anything with a confidentiality lifespan extending years into the future — should be treated as already at risk.

Step Four: Design for Crypto-Agility

The technical architecture should be designed for crypto-agility — the ability to swap cryptographic algorithms without dismantling entire systems. This means using hybrid cryptographic approaches and modernized certificate management that can accommodate algorithm transitions as standards evolve. Locking architecture to a single algorithm, even a post-quantum one, introduces fragility that organizations will later regret.

Step Five: Require Vendor Readiness — Immediately

Vendor readiness is a critical and often overlooked step. Srivastava recommends pushing suppliers for their PQC roadmaps immediately and building quantum readiness into procurement contracts as a formal requirement rather than an informal expectation. This costs nothing to ask for and signals to the market that your organization takes supply chain cryptographic risk seriously.

Steps Six Through Ten: Test, Deploy, Operate, and Embed

Pilot testing of NIST-standardized PQC algorithms in real environments should precede any production deployment. The migration itself moves from high-risk systems through PKI infrastructure, applications, networks, and cloud services. Security operations playbooks, monitoring tools, and team training must all be updated to reflect the new cryptographic environment.

Finally, PQC readiness should be embedded into enterprise architecture planning and measured with defined KPIs — not treated as a standalone project that ends at deployment. Cryptographic posture is not a destination. It is an ongoing operational discipline.

The NIST Standards Are Ready — The Waiting Game Is Over

One objection that previously had merit was that post-quantum standards were not yet finalized. That objection no longer applies. NIST published its first set of post-quantum cryptographic standards in 2024, including FIPS 203, FIPS 204, and FIPS 205 — providing organizations with stable, government-vetted algorithms to begin migration planning in earnest. The technical foundation exists. What remains is organizational will and execution.

"We don't wait for a breach to install firewalls," Srivastava wrote. "Post-quantum cryptography deserves the same posture: prepare before the threat is real, not after."

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SecureWorld is hosting a Quantum Cryptography virtual conference on September 23, 2026, bringing together industry experts to help security teams move from concern to concrete action.

For readers tracking this issue, three considerations stand out. Any organization holding sensitive data with a long confidentiality lifespan should treat HNDL as a present-day threat rather than a future one. Beginning a cryptographic inventory now — regardless of migration timelines — provides the foundational visibility needed to plan an effective transition. And vendor procurement processes represent an immediate lever: requiring PQC roadmaps from suppliers costs nothing and builds the supply chain resilience that reactive organizations will scramble for later.