AWS Private CA
AWS Private Certificate Authority is a managed private CA service for issuing and revoking private digital certificates. No need to operate your own PKI infrastructure.
What is Private CA? (Simple Explanation)
Private CA is an AWS service in the Security category. AWS Private Certificate Authority is a managed private CA service for issuing and revoking private digital certificates.
When Would You Use Private CA?
- Enterprise internal PKI and certificate management
- Mutual TLS for service-to-service authentication
- IoT device certificate provisioning
- Code signing certificate issuance
Who Uses Private CA?
From startups to enterprises, Private CA powers:
What Makes Private CA Powerful
Private CA Pricing & Free Tier
Core security services (IAM, KMS, CloudTrail, Shield Standard) are always free. Advanced features (GuardDuty, WAF, Shield Advanced) have per-usage pricing.
Private CA Best Practices
- 1Enable MFA on all IAM users and root account
- 2Never use root account for daily tasks — create IAM users with least privilege
- 3Enable CloudTrail across all regions with log file validation
- 4Rotate access keys every 90 days and never commit them to source control
- 5Use IAM roles for EC2/Lambda/ECS instead of long-term access keys
Getting Started with Private CA in 5 Minutes
- 1Open the AWS Console and navigate to Private CA
- 2Review the default settings — most security services are pre-configured with best-practice defaults
- 3Define your policies, rules, or detection scope based on your environment
- 4Enable logging to CloudTrail and set up alerts to SNS for critical findings
Private CA CLI Quick Reference
2 production-ready commands. Full CLI Library (225+ services) →
aws private-ca helpView all Private CA CLI v2 commands and subcommandsaws private-ca describe-privateca --helpView options for describing Private CA resourcesPros & Cons of Private CA
Pros
- Managed root and subordinate CAs with HSM-backed keys
- OCSP and CRL endpoints for certificate revocation
- Certificate templates with constrained usage
- ACM integration for private cert deployment
- Audit reporting for certificate issuance
Cons
- ✕Proper IAM policy design has a steep learning curve — overly permissive policies are common
- ✕Root account is a single point of failure if MFA is lost
- ✕CloudTrail logs can become expensive at scale without lifecycle management
Private CA vs Alternatives
Private CA vs ACM
Choose Private CA for Enterprise internal PKI and certificate management and Mutual TLS for service-to-service authentication. It excels at managed root and subordinate cas with hsm-backed keys.
Choose ACM as an alternative when your requirements differ. Each service in the Security category serves different architectural patterns.
Services That Work with Private CA
Private CA is rarely used alone. It is typically combined with:
Compliance & Security
How AWS Private CA fits into major compliance standards. Browse all 41 frameworks →
Private CA configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults.
NIST 800-53Private CA access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families.
PCI DSS 4.0Private CA encryption, access control, and logging support PCI DSS for cardholder data environments.
SOC 2Private CA security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria.
ISO 27001Private CA configuration and monitoring controls map to ISO 27001 Annex A information security management.
Frequently Asked Questions About Private CA
What is AWS Private CA?
AWS Private Certificate Authority is a managed private CA service for issuing and revoking private digital certificates. No need to operate your own PKI infrastructure.
What is Private CA used for?
Private CA is commonly used for: Enterprise internal PKI and certificate management; Mutual TLS for service-to-service authentication; IoT device certificate provisioning; Code signing certificate issuance. It's a core service in the security category of AWS.
Is Private CA free?
Core security services (IAM, KMS, CloudTrail, Shield Standard) are always free. Advanced features (GuardDuty, WAF, Shield Advanced) have per-usage pricing.
What are the key features of Private CA?
Private CA's most important capabilities include: Managed root and subordinate CAs with HSM-backed keys. OCSP and CRL endpoints for certificate revocation. Certificate templates with constrained usage. ACM integration for private cert deployment. Audit reporting for certificate issuance. Each of these is designed to help teams enterprise internal pki and certificate management.
How does Private CA compare to alternatives?
Private CA competes with both AWS-native alternatives (ACM, KMS, CloudHSM) and third-party equivalents. The right choice depends on your specific requirements for scalability, cost, and operational overhead. See the comparisons section below for detailed guidance.
Which compliance frameworks apply to Private CA?
CIS AWS v3.0: Private CA configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults. NIST 800-53: Private CA access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families. PCI DSS 4.0: Private CA encryption, access control, and logging support PCI DSS for cardholder data environments. SOC 2: Private CA security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria. ISO 27001: Private CA configuration and monitoring controls map to ISO 27001 Annex A information security management.
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