Quantum-Resistant Cryptography: Why Your First Step Is A Cryptographic Inventory (And How To Build It) + Video

Introduction:

As quantum computing advances, traditional public-key cryptography (RSA, ECC) faces obsolescence. The first and most critical step toward a quantum-safe future—and sound cryptographic hygiene in general—is building a comprehensive cryptographic inventory. A cryptographic inventory is a living catalog of all cryptographic assets and mechanisms in use across your organization, from TLS certificates and code-signing keys to hashing algorithms and encrypted databases.

Learning Objectives:

Understand what a cryptographic inventory entails and why it is essential for post-quantum cryptography (PQC) readiness.
Learn to discover, catalog, and assess cryptographic assets across Linux, Windows, cloud environments, and APIs.
Implement automated scanning, vulnerability detection, and mitigation strategies for weak or deprecated cryptographic algorithms.

You Should Know:

Automated Discovery of Certificates and Keys Across Your Network
Building a cryptographic inventory starts with identifying every certificate, private key, and TLS configuration in your environment. Use the following tools and commands to scan on-premises and cloud assets.

Step‑by‑step guide – Linux/macOS:

Use `openssl s_client` to probe a service’s certificate:

echo | openssl s_client -connect example.com:443 -servername example.com 2>/dev/null | openssl x509 -text -noout

Scan entire subnets with `nmap` and its `ssl-cert` script:

nmap -p 443 --script ssl-cert 192.168.1.0/24 -oA cert_scan

For a deeper analysis of TLS strength, install testssl.sh:

git clone https://github.com/drwetter/testssl.sh.git
cd testssl.sh
./testssl.sh --jsonfile-pretty inventory.json example.com

Step‑by‑step guide – Windows:

List all certificates in the local machine store using PowerShell:

Get-ChildItem -Path Cert:\LocalMachine\ -Recurse | Select-Object Subject, Thumbprint, NotAfter, NotBefore | Export-Csv -Path cert_inventory.csv

For IIS bindings and SSL certificates:

Get-IISSite | Select-Object Name, Bindings | ForEach-Object { $_.Bindings }

Cataloging Cryptographic Assets in Cloud Environments (Azure, AWS)
Cloud services often use managed keys, secrets, and certificates. You must inventory these to ensure quantum-safe readiness.

Step‑by‑step guide – Azure:

Use Azure CLI to list Key Vault keys, secrets, and certificates:

az keyvault key list --vault-name MyKeyVault --output table
az keyvault secret list --vault-name MyKeyVault --output table
az keyvault certificate list --vault-name MyKeyVault --output table

Export all TLS certificates from Application Gateway and API Management:

az network application-gateway ssl-cert list --resource-group MyRG --gateway-name MyGateway

Step‑by‑step guide – AWS:

List all ACM certificates and their expiry:

aws acm list-certificates --query 'CertificateSummaryList[].[DomainName,NotAfter]' --output table

Enumerate KMS keys and their cryptographic configuration (RSA, ECC, or Symmetric):

aws kms list-keys --query 'Keys[].KeyId' | xargs -I {} aws kms describe-key --key-id {}

Assessing Cryptographic Algorithms for Weakness and Quantum Vulnerability
Once you have an inventory, evaluate each asset against known weaknesses (SHA-1, RSA-1024, CBC mode) and quantum sensitivity (RSA/ECC being Shor‑vulnerable).

Step‑by‑step guide – Using openssl and custom scripts:

Check a certificate’s signature algorithm and key length:

openssl x509 -in cert.pem -text -noout | grep -E "Signature Algorithm|Public-Key"

Bulk assessment with `cryptography` Python library:

from cryptography import x509
from cryptography.hazmat.backends import default_backend
with open("cert.pem", "rb") as f:
cert = x509.load_pem_x509_certificate(f.read(), default_backend())
print(f"Subject: {cert.subject}")
print(f"Public key size: {cert.public_key().key_size}")
print(f"Signature algo: {cert.signature_algorithm_oid._name}")

Detect deprecated ciphers in TLS configurations using nmap:
```
nmap --script ssl-enum-ciphers -p 443 target.com
```

4. Remediation and Mitigation: Replacing Weak Cryptography

After identification, phase out weak algorithms. For example, replace SHA‑1 signatures, upgrade RSA keys to 2048+ bits, and plan for PQC algorithms (e.g., CRYSTALS‑Kyber, CRYSTALS‑Dilithium).

Step‑by‑step guide – Linux:

Generate a new RSA‑3072 or ECC P‑384 certificate:

openssl req -new -newkey rsa:3072 -nodes -keyout newkey.pem -out newreq.pem

Convert a service from TLS 1.0/1.1 to TLS 1.3 (e.g., Nginx):

ssl_protocols TLSv1.3;
ssl_ciphers TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256;

Step‑by‑step guide – Windows (IIS):

Use `certreq` to renew with stronger key length:

certreq -new -config "MyCA" strong_key.inf strong_key.req

Disable weak protocols via Group Policy: Computer Configuration → Administrative Templates → Network → SSL Configuration Settings.

API Security: Inventorying Tokens, Signing Keys, and JWT Algorithms
APIs often rely on JSON Web Tokens (JWT) that may use weak signing algorithms (HS256 with guessable secrets, or none algorithm). Include these in your cryptographic inventory.

Step‑by‑step guide:

Discover API endpoints using `ffuf` or Burp Suite, then extract JWT from `Authorization` headers.
Validate JWT algorithm and key strength with jwt_tool:
```
python3 jwt_tool.py <JWT_TOKEN> -X a -d "alg:none"
```

For API gateways (Kong, AWS API Gateway), export all TLS and signing configurations:

Kong example
curl -s http://localhost:8001/plugins | jq '.data[] | select(.name == "jwt")'

Automating Continuous Cryptographic Inventory with Open Source Tools
Manual inventories become outdated quickly. Use tools like cryptography-discovery, Trivy, or `Vaultra` to maintain a live catalog.

Step‑by‑step guide – Using Trivy (Aqua Security):

Scan container images for certificates and weak crypto:

trivy image --severity CRITICAL --vuln-type os --security-checks secret myapp:latest

For filesystem scanning (including PEM files):

trivy filesystem --scanners secret,config /etc/ssl/

Step‑by‑step guide – Custom cron job to inventory daily:

!/bin/bash
 daily_crypto_inventory.sh
nmap -p 443,465,993,995 --script ssl-cert 10.0.0.0/24 > /var/log/certs_$(date +%F).log
aws acm list-certificates --region us-east-1 >> /var/log/aws_certs_$(date +%F).log

What Undercode Say:

Key Takeaway 1: A cryptographic inventory is not optional—it is the foundation for any quantum‑readiness roadmap and helps prevent outages from expired certificates or weak crypto attacks.
Key Takeaway 2: Automation and continuous monitoring are critical; manual spreadsheets cannot scale across hybrid cloud environments.

Analysis: The shift to post‑quantum cryptography (PQC) will require organizations to replace all vulnerable asymmetric keys simultaneously. Without an accurate inventory, this becomes impossible. Moreover, many breaches (e.g., SolarWinds) involved compromised signing keys that went unnoticed because no inventory existed. Start today by scanning your networks, cloud providers, and code repositories. Integrate inventory results into your SIEM or CMDB. Finally, prioritize systems handling long‑lived secrets (like firmware signing) for early PQC migration.

Prediction:

Within three years, regulatory frameworks (e.g., NIST SP 1800‑38, GDPR revisions) will mandate regular cryptographic inventories and documented quantum‑risk assessments. Organizations that fail to automate this process will face compliance fines and extended migration windows, leaving them vulnerable to “harvest now, decrypt later” attacks. By 2030, we expect cryptographic inventory tools to be embedded into every major cloud console and CI/CD pipeline, much like vulnerability scanners are today.

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