> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-fix-nav-issues.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Contains information about available certificates and their sources.

# system.certificates

<h2 id="description">
  Description
</h2>

Contains information about available certificates and their sources.

<h2 id="columns">
  Columns
</h2>

* `version` ([Int32](/reference/data-types/index)) — Version of the certificate. Values are 0 for v1, 1 for v2, 2 for v3.
* `serial_number` ([Nullable(String)](/reference/data-types/index)) — Serial Number of the certificate assigned by the issuer.
* `signature_algo` ([Nullable(String)](/reference/data-types/index)) — Signature Algorithm - an algorithm used by the issuer to sign this certificate.
* `issuer` ([Nullable(String)](/reference/data-types/index)) — Issuer - a unique identifier for the Certificate Authority issuing this certificate.
* `not_before` ([Nullable(String)](/reference/data-types/index)) — The beginning of the time window when this certificate is valid.
* `not_after` ([Nullable(String)](/reference/data-types/index)) — The end of the time window when this certificate is valid.
* `subject` ([Nullable(String)](/reference/data-types/index)) — Subject - identifies the owner of the public key.
* `pkey_algo` ([Nullable(String)](/reference/data-types/index)) — Public Key Algorithm defines the algorithm the public key can be used with.
* `path` ([String](/reference/data-types/index)) — Path to the file or directory containing this certificate.
* `default` ([UInt8](/reference/data-types/index)) — Certificate is in the default certificate location.
* `protocol` ([String](/reference/data-types/index)) — Protocol name if certificate is from per-protocol TLS config, otherwise empty.