Preparing for Post-Quantum: the Application Agility Audit

If you sit in the C-suite or lead defensive security teams within a regulated sector, you are probably suffering from “next-gen” fatigue. Agentic AI deployments, evolving regulatory frameworks like DORA, and confusing vendor “next big thing” hype… the last thing you want to hear about is another paradigm-shifting technology. But while quantum computing still feels like the domain of experimental physics labs, its shadow is real for cybersecurity today.

We know that CISOs, CSOs, CIOs, and Chief Risk Officers in financial services, healthcare, are working on the practicalities: a threat model, a timeline, and a checklist. Because when a cryptographically relevant quantum computer arrives, it threatens to both disrupt your business model but potentially break the foundational mathematics holding your existing digital trust together.

The Reality Check: Harvest Now, Decrypt Later (HNDL)

The most common misconception about the quantum threat is that it only matters once the hardware is fully realised. This is a dangerous misunderstanding of how malicious actors operate.

State-sponsored groups and sophisticated syndicates are actively engaged in HNDL: Harvest Now, Decrypt Later.

They are intercepting and storing high-value, heavily encrypted traffic from financial institutions, healthcare registries, and public sector networks right now. While they cannot read it today, they know that a quantum machine running Shor’s algorithm will unravel standard asymmetric encryption (RSA and ECC) in seconds.

If you are protecting health records, national security data, or financial instruments, your data is already vulnerable. The breach has effectively happened; the adversary is simply waiting for the decryption key to be built.

Government enforcement mandates

This is no longer a theoretical exercise for the future. Over the last few years, global regulators and governments have moved from issuing warnings to codifying strict, mandatory timelines for Post-Quantum Cryptography (PQC) migration:

• EU Digital Operational Resilience Act (DORA): The Central Bank of Ireland and EU regulators are treating systemic public-key infrastructure (PKI) vulnerability as an imminent threat to operational resilience. Financial services are expected to map their cryptographic supply chains to avoid catastrophic, single-point failures.
• The Commercial National Security Algorithm Suite (CNSA 2.0): The NSA has set firm deadlines requiring firmware, operating systems, and web browsers used in national security systems to fully adopt quantum-resistant algorithms by 2030, with some mandates hitting as early as 2025.
• The US Quantum Computing Cybersecurity Preparedness Act: This law mandates that all federal agencies inventory their systems and explicitly plan their migration to PQC standards finalized by NIST.

If your software services plug into state infrastructure, banking networks, or public health systems, PQC compliance is rapidly becoming a non-negotiable procurement baseline.

The Strategy: focus on cryptographic agility

Historically, changing an encryption algorithm meant a multi-year re-engineering project because keys and algorithms were hardcoded deep within legacy application code. If your software requires a complete rewrite every time an algorithm is compromised, your architecture is fundamentally flawed.

The solution is cryptographic agility. This is building software where the underlying cryptographic layers are completely abstracted from the application logic. If an algorithm fails, you should be able to swap it out via configuration changes, not a code overhaul.

To achieve this, defensive teams, penetration testers, and security architects must shift their focus to three immediate pillars:

1. Audit Your Supply Chain & dependencies

You are only as secure as your third-party dependencies. If you run penetration testing or continuous validation, shift the focus toward your vendors. Seek a Software Bill of Materials (SBOM) that specifically highlights the cryptographic protocols used by your SaaS providers, cloud vendors, and API integrations.

2. Update Your Testing Protocols for PQC Overhead

Quantum-resistant algorithms (like ML-KEM or ML-DSA) use significantly larger key sizes and require more processing power to execute handshakes. When your teams conduct load and DDoS testing, you must simulate the computational overhead of PQC handshakes. Larger keys mean more data over the wire and higher CPU utilization during TLS negotiations. If your firewalls or API gateways are not tuned for this increased stress, your own quantum-safe defense could become the bottleneck that brings your services down.

What we can offer: The Application Agility Audit

At Marino Software, we help organisations in highly regulated environments to map their technical risk to actual business realities. Before you invest in expensive, unproven quantum tools, you need a baseline understanding of where your current software stands.

An Application Agility Audit is the foundational step. We work alongside your internal security and engineering teams to:

• Discover where hardcoded encryption algorithms are buried in your codebase
• Identify hidden risks in your third-party APIs and open-source dependencies
• Build a migration roadmap to decouple your cryptographic layers, ensuring your software is structurally prepared to swap in NIST-approved PQC standards without breaking your core architecture.

We are doing this already with several clients. Ready to future-proof your systems against the post-quantum shift? Contact us today to schedule an Application Agility Audit.