keyId

The Key Management Service (KMS) ID that you want to use to encrypt a parameter. Use a custom key for better security. Required for parameters that use the SecureString data type.

If you don't specify a key ID, the system uses the default key associated with your Amazon Web Services account, which is not as secure as using a custom key.

• To use a custom KMS key, choose the SecureString data type with the Key ID parameter.