void authenticate(String to, Object credentials, String ipAddress)
{
Authenticator auth = getAuth();
if (credentials instanceof SignedCredentials) {
SignedCredentials signedCred = (SignedCredentials) credentials;
String uid = signedCred.getUid();
String nonce = signedCred.getNonce();
String signature = signedCred.getSignature();
/*
String savedNonce = _nonceMap.get(uid);
if (savedNonce == null)