# Source: https://infisical.com/docs/documentation/platform/pki/enrollment-methods/est.md

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# Certificate Enrollment via EST

## Concept

The EST enrollment method allows you to issue and manage certificates against a specific [certificate profile](/documentation/platform/pki/certificates/profiles) using the [EST protocol](https://en.wikipedia.org/wiki/Enrollment_over_Secure_Transport).
This method is suitable for environments requiring strong authentication and encrypted communication, such as in IoT, enterprise networks, and secure web services.

Infisical's EST service is based on [RFC 7030](https://datatracker.ietf.org/doc/html/rfc7030) and implements the following endpoints:

* **cacerts** - provides the necessary CA chain for the client to validate certificates issued by the CA.
* **simpleenroll** - allows an EST client to request a new certificate from Infisical's EST server
* **simplereenroll** - similar to the /simpleenroll endpoint but is used for renewing an existing certificate.

These EST endpoints are exposed on port 8443 under the .well-known/est path
and structured under `https://app.infisical.com:8443/.well-known/est/{profile_id}/...`

## Prerequisites

* Your client devices need to have a bootstrap/pre-installed certificate.
* Your client devices must trust the server certificates used by Infisical's EST server. If the devices are new or lack existing trust configurations, you need to manually establish trust for the appropriate certificates.

<Note>
  For Infisical Cloud users, the devices must be configured to trust the [Amazon
  root CA certificates](https://www.amazontrust.com/repository).
</Note>

## Guide to Certificate Enrollment via EST

In the following steps, we explore how to issue a X.509 certificate using the EST enrollment method.

<Steps>
  <Step title="Create a certificate profile in Infisical">
    Create a [certificate
    profile](/documentation/platform/pki/certificates/profiles) with **EST**
    selected as the enrollment method and fill in EST-specific configuration.

        <img src="https://mintlify.s3.us-west-1.amazonaws.com/infisical/images/platform/pki/enrollment-methods/est/est-config.png" alt="pki est config" />

    Here's some guidance on each EST-specific configuration field:

    * Disable Bootstrap CA Validation: Enable this if your devices are not configured with a bootstrap certificate.
    * EST Passphrase: This is also used to authenticate your devices with Infisical's EST server. When configuring the clients, use the value defined here as the EST password.
    * CA Chain Certificate: This is the certificate chain used to validate your devices' manufacturing/pre-installed certificates. This will be used to authenticate your devices with Infisical's EST server.
  </Step>

  <Step title="Obtain the EST label">
    Once the EST enrollment method configuration is complete, you can use the ID of the associated certificate profile
    `profile_id` as the EST label when enrolling EST clients with Infisical.

        <img src="https://mintlify.s3.us-west-1.amazonaws.com/infisical/images/platform/pki/enrollment-methods/est/est-label.png" alt="pki est label" />

    The complete URL structure of the supported EST endpoints may look like the following:

    * [https://app.infisical.com:8443/.well-known/est/\{profile\_id}/cacerts](https://app.infisical.com:8443/.well-known/est/\{profile_id}/cacerts)
    * [https://app.infisical.com:8443/.well-known/est/\{profile\_id}/simpleenroll](https://app.infisical.com:8443/.well-known/est/\{profile_id}/simpleenroll)
    * [https://app.infisical.com:8443/.well-known/est/\{profile\_id}/simplereenroll](https://app.infisical.com:8443/.well-known/est/\{profile_id}/simplereenroll)
  </Step>

  <Step title="Configure EST clients">
    To use the EST passphrase in your clients, configure it as the EST password. The EST username can be set to any arbitrary value.
    Use the appropriate client certificates for invoking the EST endpoints.

    * For `simpleenroll`, use the bootstrapped/manufacturer client certificate.
    * For `simplereenroll`, use a valid EST-issued client certificate.
      When configuring the PKCS#12 objects for the client certificates, only include the leaf certificate and the private key.
  </Step>
</Steps>