I tried updating local_policy.jar and US_export_policy.jar jars also but no luck. I am still getting the same exception.

what i understand is error is while validating the signature only. for me it seems to be some JDK related issue. I have cross checked the certifcate and it is correct only.14.03.2018 03:01:59.223 *ERROR* [qtp-1211009574-2288] com.adobe.granite.auth.saml.util.SamlReader Failed validating signature.  ...

We have setup the SAML authentication handler in our AEM instance. We have followed the following link:SAML 2.0 Authentication Handler We are getting the login screen of IDP and after login, i am getting redirected to http://<server>/libs/granite/core/content/login.error.html?j_reason=invalid_tokenf...