**To register a self signed device certificate**

The following ``register-certificate`` example registers the ``deviceCert.pem`` device certificate signed by the ``rootCA.pem`` CA certificate. The CA certificate must be registered before you use it to register a self-signed device certificate. The self-signed certificate must be signed by the same CA certificate you pass to this command. ::

    aws iot register-certificate \
        --certificate-pem file://deviceCert.pem \
        --ca-certificate-pem file://rootCA.pem

Output::

    {
        "certificateArn": "arn:aws:iot:us-west-2:123456789012:cert/488b6a7f2acdeb00a77384e63c4e40b18b1b3caaae57b7272ba44c45e3448142",
        "certificateId": "488b6a7f2acdeb00a77384e63c4e40b18b1b3caaae57b7272ba44c45e3448142"
     }

For more information, see `RegisterCertificate <https://docs.aws.amazon.com/iot/latest/apireference/API_RegisterCertificate.html>`__ in the *AWS IoT API Reference*.