Decrypting the Quantum Threat: A CISO’s Guide to PQC Strategy

For years, quantum computing has been viewed as a distant technological breakthrough, promising unprecedented computational power but posing limited immediate concern for enterprise security. Most organizations have therefore focused their cybersecurity investments on more pressing challenges such as ransomware, AI-driven attacks, identity security, cloud resilience, and zero-trust architectures.

Yet beneath this perception lies an uncomfortable reality. Modern digital infrastructure, from online banking and digital identities to cloud services, software supply chains, VPNs, and critical infrastructure, relies heavily on public-key cryptography such as Rivest-Shamir-Adleman (RSA) algorithm and elliptic curve cryptography (ECC). These algorithms form the foundation of digital trust but are expected to become susceptible to attacks by cryptographically relevant quantum computers once such systems become practically viable.

For CISOs, the challenge is not that quantum computers have already arrived, but that enterprise cryptographic ecosystems were never designed for rapid algorithm replacement. Cryptography is deeply embedded across applications, certificates, APIs, networks, operating systems, cloud platforms, and third-party software, often without centralized visibility or governance.

In an Avasant paper, “Quantum Resilience: Navigating Cybersecurity in a Quantum World,” we explored how quantum computing fundamentally alters the cybersecurity landscape, highlighting risks such as the “Harvest Now, Decrypt Later” threat and the need for organizations to begin their quantum readiness journey before the technology reaches maturity.

Since then, the conversation has evolved considerably. The publication of NIST’s first Post-Quantum Cryptography (PQC) standards (FIPS 203, 204, and 205) in 2024 marked an important inflection point by providing standardized quantum-resistant algorithms that enterprises can begin planning around.

For today’s CISOs, the question is no longer whether quantum-safe cryptography will become necessary, but how to prepare the enterprise for one of the most significant cryptographic transitions in decades.

Several developments have accelerated enterprise interest in PQC. The formalization of NIST standards has reduced uncertainty around algorithm selection, regulators are increasingly encouraging organizations to identify cryptographic dependencies, and concerns over long-lived sensitive data have elevated quantum readiness from a research initiative to a strategic planning priority. Together, these factors are shifting enterprise discussions from theoretical preparedness to practical execution.

Why PQC Demands Boardroom Attention

Preparing for the quantum era is significantly more complex than replacing one encryption algorithm with another. The challenge extends beyond technology modernization. It requires organizations to gain visibility into their cryptographic landscape, manage enterprise-wide risk, and establish governance for a transition that is expected to unfold over several years. Key challenges include:

1. Limited cryptographic visibility: Most organizations cannot accurately answer a seemingly simple question: Where does cryptography exist across our enterprise? Without a comprehensive inventory of cryptographic assets, algorithms, certificates, keys, and dependencies, organizations have no reliable way to assess their quantum exposure.
2. Complex migration environments: Migration itself presents another layer of complexity. Large enterprises operate highly heterogeneous environments built over decades of modernization, mergers, cloud adoption, and third-party integrations. Replacing cryptography across thousands of applications, identities, APIs, network devices, and cloud services requires careful planning to avoid operational disruption. Enterprise discussions consistently indicate that discovery, inventory, and risk assessment, not migration, remain the immediate priorities.
3. Performance and interoperability constraints: Adding to these challenges are practical implementation concerns. PQC algorithms introduce larger keys, greater computational requirements, increased network latency, interoperability issues across vendors, and new governance requirements.
4. Skills and governance gaps: At the same time, many organizations lack specialized expertise in PQC while simultaneously facing evolving regulatory expectations and the need to establish enterprise-wide governance for cryptographic life cycle management.

The conversation has therefore shifted from whether organizations should prepare for quantum computing to how they can do so without disrupting business operations.

Drawing on insights from research and enterprise discussions for Avasant’s Cybersecurity Services 2026 Market Insights™, this paper outlines a pragmatic road map that enables CISOs to move from quantum awareness to quantum readiness. The emphasis is not on immediate algorithm replacement, but on establishing the governance, visibility, and crypto agility required for a phased, low-risk transition.

Building a Practical PQC Strategy

Current market activity suggests that successful PQC adoption begins with preparation, not migration.

Rather than attempting immediate algorithm replacement, leading organizations are focusing on five strategic priorities that establish the foundation for long-term quantum readiness.

1. Establish enterprise-wide cryptographic visibility
   The first priority is building a comprehensive inventory of cryptographic assets through Crypto Bills of Materials (CBOMs) and automated discovery tools.A CBOM provides a structured inventory of cryptographic algorithms, keys, certificates, libraries, and dependencies across enterprise systems, enabling organizations to identify quantum-vulnerable assets and prioritize remediation.By establishing visibility across applications, cloud environments, public key infrastructure (PKI), APIs, networks, endpoints, and third-party software, CBOMs help organizations understand cryptographic dependencies, assess business risk, and develop phased migration plans. Without this foundational visibility, organizations cannot accurately measure quantum risk or prioritize remediation efforts.

   Case Study: Enterprise Crypto Inventory for a German Cooperative Bank

   A leading German cooperative bank initiated an enterprise-wide cryptographic inventory program to support both DORA compliance and PQC readiness. The bank lacked a centralized crypto inventory across its global environment, with cryptographic assets managed in silos and no unified visibility into algorithms, keys, or certificate usage. Leadership also required a comprehensive cryptographic register to support enterprise-wide risk scoring and long-term PQC planning.

   To address these challenges, the bank developed a structured CBOM model covering applications, infrastructure, and endpoints. Standardized parameters were defined for every cryptographic component, while automated scan outputs and application owner inputs were consolidated into a centralized inventory. Application-level CBOMs cataloged cryptographic keys, certificates, algorithms, libraries, dependencies, and cryptographic controls, with each component assigned a PQC susceptibility score to support future migration planning.

   The initiative delivered a consolidated enterprise-wide crypto inventory spanning applications, infrastructure, cloud, network, and third-party systems. It also produced application-level CBOMs with full traceability of cryptographic assets, generated a DORA and PQC gap assessment, and enabled leadership to prioritize the organization’s PQC road map, drive crypto modernization, and adopt bank-wide cryptographic policies and frameworks.

2. Prioritize risk, not infrastructure
   Not every cryptographic asset requires immediate attention. CISOs should prioritize systems based on business criticality, regulatory requirements, data sensitivity, and expected operational lifespan. Long-lived sensitive information and externally exposed systems should receive priority because they face greater exposure to future quantum threats.Risk-based prioritization allows organizations to spread investments across multiple years while focusing first on areas delivering the greatest security benefit.
3. Validate through pilots before scaling
   Early adopters are increasingly conducting controlled pilot programs using hybrid cryptography that combines classical algorithms with quantum-resistant alternatives.These pilots help organizations evaluate performance, interoperability, operational processes, vendor maturity, and implementation challenges before broader deployment. They also provide valuable experience in updating governance models, PKI, and application architectures.
4. Make crypto agility the end goal
   Perhaps the most important lesson emerging from early PQC initiatives is that organizations should not design for a single cryptographic transition.Instead, CISOs should invest in crypto agility, the ability to replace or update cryptographic algorithms quickly without redesigning applications or infrastructure.Crypto agility transforms PQC from a one-time migration project into a long-term architectural capability that enables organizations to respond efficiently as standards, threats, and technologies continue to evolve.
5. Strengthen governance across the cryptographic estate
   PQC is as much a governance challenge as a technology initiative.Successful programs integrate cryptographic inventory management, vendor assessments, life cycle governance, continuous monitoring, compliance reporting, and executive oversight into existing cybersecurity governance frameworks.Because cryptography extends across internal systems and third-party ecosystems, CISOs must ensure suppliers, cloud providers, software vendors, and technology partners maintain credible quantum-readiness road maps alongside their own modernization efforts.

While the strategic priorities for PQC are becoming increasingly clear, enterprise adoption remains in its early stages. Most organizations are still establishing the foundational capabilities needed for quantum readiness before embarking on large-scale migration.

Where Enterprise Adoption Stands Today

According to Avasant’s Cybersecurity Services 2026 Market Insights™ survey (January–February 2026), only 5%–10% of enterprises have initiated structured PQC discovery or inventory programs. Early adoption is concentrated among highly regulated industries such as financial services and telecommunications, where long-lived sensitive data, regulatory mandates, and mission-critical infrastructure have accelerated the need for quantum preparedness.

Rather than pursuing an immediate cryptographic replacement, enterprises are following a phased approach that begins with gaining visibility into their cryptographic assets before progressing toward broader quantum-safe migration. As illustrated below, organizations are prioritizing cryptographic discovery, risk assessment, pilot implementations, and governance while building the crypto agility needed for future migration.

This phased approach also reflects the anticipated market trajectory. Avasant expects enterprise adoption to follow a phased progression over the next several years:

1. 2025–2026: Cryptographic discovery, inventory development, governance preparation, and compliance readiness.
2. 2027–2029: Broader deployment of hybrid cryptography as standards and vendor ecosystems mature.
3. Post-2030: Large-scale migration from legacy RSA and ECC implementations toward quantum-safe cryptography.

For most organizations, the immediate objective is therefore not migration, but preparation.

Preparing for the Quantum Future

The transition to PQC will span several years and involve far more than deploying new cryptographic algorithms. It requires comprehensive cryptographic discovery, risk-based prioritization, crypto-agile architectures, strong governance, and close collaboration across technology, security, and business teams.

Organizations that begin this journey today will be able to execute a phased, business-aligned migration as standards, vendor ecosystems, and regulatory expectations mature. Those who delay foundational discovery and planning risk facing a significantly more complex and disruptive transition later this decade.

For CISOs, the question is no longer whether quantum computing will reshape enterprise cryptography, it is whether their organizations will be ready when that transition begins. The organizations that invest today in cryptographic visibility, governance, and crypto agility will be best positioned to navigate the post-quantum era with confidence.

By Gaurav Dewan, Research Director