KMS / Client / create_alias



Creates a friendly name for a KMS key.


Adding, deleting, or updating an alias can allow or deny permission to the KMS key. For details, see ABAC for KMS in the Key Management Service Developer Guide.

You can use an alias to identify a KMS key in the KMS console, in the DescribeKey operation and in cryptographic operations, such as Encrypt and GenerateDataKey. You can also change the KMS key that’s associated with the alias ( UpdateAlias) or delete the alias ( DeleteAlias) at any time. These operations don’t affect the underlying KMS key.

You can associate the alias with any customer managed key in the same Amazon Web Services Region. Each alias is associated with only one KMS key at a time, but a KMS key can have multiple aliases. A valid KMS key is required. You can’t create an alias without a KMS key.

The alias must be unique in the account and Region, but you can have aliases with the same name in different Regions. For detailed information about aliases, see Using aliases in the Key Management Service Developer Guide.

This operation does not return a response. To get the alias that you created, use the ListAliases operation.

The KMS key that you use for this operation must be in a compatible key state. For details, see Key states of KMS keys in the Key Management Service Developer Guide.

Cross-account use: No. You cannot perform this operation on an alias in a different Amazon Web Services account.

Required permissions

For details, see Controlling access to aliases in the Key Management Service Developer Guide.

Related operations:

  • DeleteAlias

  • ListAliases

  • UpdateAlias

Eventual consistency: The KMS API follows an eventual consistency model. For more information, see KMS eventual consistency.

See also: AWS API Documentation

Request Syntax

response = client.create_alias(
  • AliasName (string) –


    Specifies the alias name. This value must begin with alias/ followed by a name, such as alias/ExampleAlias.


    Do not include confidential or sensitive information in this field. This field may be displayed in plaintext in CloudTrail logs and other output.

    The AliasName value must be string of 1-256 characters. It can contain only alphanumeric characters, forward slashes (/), underscores (_), and dashes (-). The alias name cannot begin with alias/aws/. The alias/aws/ prefix is reserved for Amazon Web Services managed keys.

  • TargetKeyId (string) –


    Associates the alias with the specified customer managed key. The KMS key must be in the same Amazon Web Services Region.

    A valid key ID is required. If you supply a null or empty string value, this operation returns an error.

    For help finding the key ID and ARN, see Finding the Key ID and ARN in the Key Management Service Developer Guide .

    Specify the key ID or key ARN of the KMS key.

    For example:

    • Key ID: 1234abcd-12ab-34cd-56ef-1234567890ab

    • Key ARN: arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab

    To get the key ID and key ARN for a KMS key, use ListKeys or DescribeKey.




  • KMS.Client.exceptions.DependencyTimeoutException

  • KMS.Client.exceptions.AlreadyExistsException

  • KMS.Client.exceptions.NotFoundException

  • KMS.Client.exceptions.InvalidAliasNameException

  • KMS.Client.exceptions.KMSInternalException

  • KMS.Client.exceptions.LimitExceededException

  • KMS.Client.exceptions.KMSInvalidStateException


The following example creates an alias for the specified KMS key.

response = client.create_alias(
    # The alias to create. Aliases must begin with 'alias/'. Do not use aliases that begin with 'alias/aws' because they are reserved for use by AWS.
    # The identifier of the KMS key whose alias you are creating. You can use the key ID or the Amazon Resource Name (ARN) of the KMS key.


Expected Output:

    'ResponseMetadata': {
        '...': '...',