PCI DSS 4.2.1.1: Maintain Certificate Inventory
Certificate and key inventory management is foundational to protecting cardholder data during transmission. PCI DSS 4.2.1.1 requires organizations to document and track every trusted key and certificate used to secure PAN, ensuring nothing slips through unmonitored. Without visibility into your cryptographic assets, you cannot detect compromised or expired certificates before they become security incidents.
What this means
This control mandates that you create and maintain a comprehensive, documented inventory of all trusted keys and certificates deployed across your environment for protecting payment card data in transit. The inventory must track which certificates are active, their expiration dates, usage locations, and responsible parties. This applies to both external certificates (obtained from certificate authorities) and internally-generated keys used in encryption and authentication processes.
How to comply
- 1.Document all certificates and keys used to protect PAN during transmission in a centralized inventory
- 2.Record certificate details including issuer, expiration date, algorithm, key length, and deployment location
- 3.Identify the business owner and technical contact responsible for each certificate
- 4.Establish a process to regularly review and validate the inventory against actual deployed certificates
- 5.Monitor certificate expiration dates and plan renewal activities 30-90 days in advance
- 6.Remove or deactivate certificates from inventory when they are retired or replaced
- 7.Maintain audit trails showing when certificates were added, modified, or removed from inventory
Evidence auditors look for
- Certificate inventory spreadsheet or database with issuer, expiration, location, and owner fields
- Automated certificate discovery and scanning reports from cryptographic asset management tools
- Certificate lifecycle management workflow documentation
- Expiration alert and renewal tracking records
- Certificate retirement or deactivation logs
- Periodic inventory reconciliation reports comparing documented vs. deployed certificates
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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