}
private static void addAuthorityId(Element assertion , FilterProcessingContext fp){
EncryptionPolicy ep = (EncryptionPolicy)fp.getInferredPolicy();
if( ep != null){
AuthenticationTokenPolicy.SAMLAssertionBinding kb = (AuthenticationTokenPolicy.SAMLAssertionBinding ) ep.newSAMLAssertionKeyBinding();
String issuer = assertion.getAttribute("Issuer");
kb.setAuthorityIdentifier(issuer);
}
}