Cryptographic Inventory Strategy for Quantum Readiness

Introduction

Post-quantum cryptography is approaching, but Microsoft says the biggest challenge for most organizations is not selecting new algorithms. It is understanding where cryptography is already used across applications, infrastructure, devices, and services. Without that visibility, security teams cannot assess risk, plan migrations, or respond quickly to new vulnerabilities and compliance mandates.

What Microsoft is recommending

Microsoft’s new guidance centers on building a cryptographic inventory: a living catalog of certificates, keys, protocols, libraries, algorithms, secrets, HSMs, and encrypted sessions across the environment.

The company frames this as the foundation of Cryptography Posture Management (CPM), an ongoing lifecycle rather than a one-time discovery project.

The six-stage CPM lifecycle

• Discover cryptographic signals across code, runtime, network traffic, and storage
• Normalize data into a consistent inventory schema
• Assess risk against policies, standards, and known vulnerabilities
• Prioritize findings by exposure, asset criticality, and compliance impact
• Remediate through key rotation, library updates, protocol changes, and algorithm replacement
• Continuously monitor for new deployments, drift, renewals, and emerging threats

The four domains to cover

Microsoft recommends mapping inventory efforts across:

• Code: cryptographic libraries and primitives in source code
• Storage: certificates, keys, secrets, and vault contents
• Network: TLS, SSH, cipher suite negotiations, and encrypted sessions
• Runtime: active cryptographic operations and in-memory key usage

Why this matters for IT and security teams

This guidance matters beyond future quantum migration planning. Microsoft notes that cryptographic inventory is increasingly tied to governance and regulatory expectations, including DORA, OMB M-23-02, and PCI DSS 4.0.

For administrators, a complete inventory improves:

• Compliance readiness by identifying where regulated cryptographic controls are used
• Risk prioritization by separating high-exposure weaknesses from lower-risk internal assets
• Crypto agility by making it easier to find and update affected systems when algorithms or libraries change

A key message from Microsoft is that cryptographic posture management requires clear ownership and repeatable processes. A one-time scan will not keep pace with changing certificates, new code, or evolving policy baselines.

Next steps

Organizations already using Microsoft Security and Azure tools may have much of the required telemetry in place. The recommended next step is to connect those signals into a normalized inventory and then extend visibility with partner solutions where deeper coverage is needed.

Security leaders should start by defining inventory scope, assigning ownership across teams, and identifying the highest-value assets to assess first. That operational groundwork will be critical for both post-quantum planning and day-to-day cryptographic hygiene.