I am trying to authenticate a user by using Appian API using the &quot;authentichttps://community.appian.com/discussions/f/administration/465/i-am-trying-to-authenticate-a-user-by-using-appian-api-using-the-authenticI am trying to authenticate a user by using Appian API using the &quot;authenticate&quot; fuunction of &quot;UserService&quot;. To this method, I am passing the password which is hashed (SHA-512) and base64 encoded byte[] using UTF-8 character-set something like that inen-USTelligent Community 12RE: I am trying to authenticate a user by using Appian API using the "authentichttps://community.appian.com/thread/1450?ContentTypeID=1Mon, 04 Mar 2013 11:03:19 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:8b4b597a-2842-43ad-ba96-3cdb126c0884subodhsSathya, there is a specific requirement that user should be asked to enter his credentials while he is submitting his form and system should authenticate this user..only if user credentails are correct, he should be allowed to submit the form...<div style="clear:both;"></div>RE: I am trying to authenticate a user by using Appian API using the "authentichttps://community.appian.com/thread/1424?ContentTypeID=1Fri, 01 Mar 2013 11:03:33 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:ec2ac8c9-6b24-4630-a19f-89a748fb6e7aSathya SrinivasanHi, can you please explain why you are using API instead of extending the spring security authentication mechanism (for e.g. for SSO)? <br /><div style="clear:both;"></div>