code: public Properties getAttributeValueAsEncryptedProperties(final String _key)
          throws EFapsException
      {
          final Properties properties = getAttributeValueAsProperties(_key, false);
          final Properties props = new EncryptableProperties(properties, SystemConfiguration.ENCRYPTOR);
          return props;
      }
docs: Returns for given <code>_key</code> the related value as Properties. If
  no attribute is found an empty Properties is returned.
  
  @param _key key of searched attribute
  @return Properties
  @throws EFapsException on error
  @see #attributes