Cert Policy Decoder

Decode certificate policy identifier extensions

About Certificate Policy Extensions

Certificate policy extensions define the policies under which a certificate was issued and how it should be validated. These extensions include Certificate Policy (CP) identifiers, Certification Practice Statement (CPS) URIs, and policy mappings. Our Cert Policy Decoder retrieves and parses these extensions from any TLS certificate, making it easy to understand the issuance policies and practices behind a certificate.

How to Use

Enter the domain name whose certificate policies you want to decode.
Adjust the port number if needed (default is 443).
Click Check to fetch and decode the certificate policy extensions.
Review the decoded policy OIDs, descriptions, CPS URIs, and any policy mappings.

Use Cases

Compliance Verification: Verify that a certificate's policies match your organization's requirements.
CA Due Diligence: Examine the certification practices of a Certificate Authority before trusting their certificates.
Certificate Research: Study the policy extensions used by different CAs and certificate profiles.
Security Auditing: Include policy validation in your certificate chain audit workflow.

Frequently Asked Questions

A Certificate Policy OID (Object Identifier) is a unique identifier that references a specific set of rules under which a certificate was issued. Each CA defines their own policies, and the OID helps relying parties look up the corresponding Certification Practice Statement.

A CPS (Certification Practice Statement) URI is a link to the document that describes the CA's practices for issuing, managing, and revoking certificates. It provides transparency into the operational procedures of the Certificate Authority.

Policy extensions help relying parties determine if a certificate is suitable for a particular purpose. For example, code signing certificates have different policy requirements than SSL/TLS server certificates. Decoding these policies helps ensure certificates are used appropriately.

Tips & Best Practices

•Focus on validation procedures and liability terms when evaluating CAs
•Compare CP/CPS summaries across CAs to make informed decisions
•Check for recent updates to CP/CPS documents as they reflect current practices
•Keep decoded summaries for compliance audit evidence

Technical Details

Documents: Certificate Policy (CP) and Certification Practice Statement (CPS)
Extracts: Validation procedures, key management, revocation policies, liability
Output: Plain-language summary with categorized findings
Formats: PDF, HTML, and plain text CP/CPS document formats