Abstract: A method and apparatus for enhancing security in an in-vehicle communication network using a gateway are provided. The gateway includes a moving average determination module configured to calculate a moving average for a transmission interval of a predetermined number of received messages and to determine whether the received messages are hacking messages by comparing the moving average with a preset maximum allowable latency. The gateway further includes a security code checking module configured to analyze, if any one of the received messages is an aperiodic message, a security code contained in the aperiodic message to determine whether the aperiodic message is a hacking message. Therefore, security in the vehicle may be enhanced.