# Grant access to code signing for Amazon IoT
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**Important**  <a name="archive-message"></a>
This is an archived version of the FreeRTOS User Guide for use with FreeRTOS release 202012.00. For the latest version of this document, see the [FreeRTOS User Guide](../../../latest/userguide/index.html).

In production environments, you should digitally sign your firmware update to ensure the authenticity and integrity of the update. You can sign your update manually or you can use Code Signing for Amazon IoT to sign your code. To use Code Signing for FreeRTOS, you must grant your IAM user account access to Code Signing for FreeRTOS.

To provide access, add permissions to your users, groups, or roles:
+ Users managed in IAM through an identity provider:

  Create a role for identity federation. Follow the instructions in [Create a role for a third-party identity provider (federation)](https://docs.amazonaws.cn//IAM/latest/UserGuide/id_roles_create_for-idp.html) in the *IAM User Guide*.
+ IAM users:
  + Create a role that your user can assume. Follow the instructions in [Create a role for an IAM user](https://docs.amazonaws.cn//IAM/latest/UserGuide/id_roles_create_for-user.html) in the *IAM User Guide*.
  + (Not recommended) Attach a policy directly to a user or add a user to a user group. Follow the instructions in [Adding permissions to a user (console)](https://docs.amazonaws.cn//IAM/latest/UserGuide/id_users_change-permissions.html#users_change_permissions-add-console) in the *IAM User Guide*.