SOAP Request Authentication
You can authenticate SOAP requests with WS-Security version 1.0 or without WS-Security. WS-Security is the more secure method. The main factor affecting whether you choose to use WS-Security is whether your current SOAP toolkit supports WS-Security.
If you are using WS-Security, you must use an X.509 certificate for authentication (Amazon Web Services can provide you with a certificate if you do not have one).
If you aren't using WS-Security, you must use SOAP 1.1; SOAP 1.2 is not supported.
