private void validate(KRSSRequest request) throws XKMSException {
validate((MessageAbstractType) request);
Authentication authentication = request.getAuthentication();
XMLSignature keyBindingAuthentication = authentication
.getKeyBindingAuthentication();
Key keyBindingAuthenticationKey = authentication
.getKeyBindingAuthenticationKey();
try {
if (!keyBindingAuthentication
.checkSignatureValue(keyBindingAuthenticationKey)) {
throw new XKMSException(XKMSException.NO_AUTHENTICATION,