Can controller safe against can-communication-based hacking attack

A controller area network (CAN) controller safe against a CAN-communication-based hacking attack comprising:

• a transmission buffer unit temporarily storing transmission data to be transmitted to a CAN bus;
• a transmission filter unit having message identifiers (IDs) allowed to be transmitted as a transmission filter, configured to search for a message identifier (ID) of the transmission data in the transmission filter, and filter the transmission data;
• a reception filter unit having message IDs allowed to be received as a reception filter, configured to search for a message ID of reception data received by the CAN bus in the reception filter, and filter the reception data;
• a protection memory storing one or more filter values of the transmission filter and one or more filter values of the reception filter;
• and
• a filter value setting unit configured to fetch the filter value stored in the protection memory to set the one or more filter values of the transmission filter of the transmission filter unit or the one or more filter values of the reception filter,
• wherein the filter value setting unit is set to a protection mode and a test mode, the filter value of the transmission filter is set as one or more filter values stored in the protection memory in the protection mode, and the one or more filter values of the transmission filter is set by the CAN controller of a controller or a microcontroller in the test mode.