// import (decrypt) message
I_ClientPlugin secPlgn = getSecurityPlugin();
if (secPlgn != null) {
MsgUnitRaw in = new MsgUnitRaw(updateKeyLiteral, content, updateQosLiteral);
CryptDataHolder dataHolder = new CryptDataHolder(MethodName.UPDATE, in, null);
MsgUnitRaw msg = secPlgn.importMessage(dataHolder);
updateKeyLiteral = msg.getKey();
content = msg.getContent();
updateQosLiteral = msg.getQos();
}