Security system and method for protecting a vehicle electronic system

A method for use with a vehicle bus that uses, is based on, or is compatible with, a Controller Area Network (CAN) standard, and the method comprising:

• storing, in a non-volatile memory in a device, a rule that includes multiple values;
• receiving, by a first serial transceiver via a first serial physical port in the device, from a serial communication bus, a first message;
• temporarily storing, in a first buffer coupled to the first transceiver in the device, the first message;
• comparing, by a processor in the device, the stored first message with the one or more values;
• changing and then sending, the first message to the vehicle bus via a second physical port by a second transceiver in the device, in response to the comparing of the first message;
• receiving, by the second transceiver via the second physical port in the device, from the vehicle bus, a second message;
• temporarily storing, in a second buffer coupled to the second transceiver in the device, the second message;
• comparing, by the processor in the device, the stored second message with the one or more values;
• changing and then sending, the second message to the serial communication bus via the first serial physical port by the first serial transceiver in the device, in response to the comparing of the second message;
• and
• adapting, by the device, between a messages rate on the vehicle bus and a messages rate on the serial communication bus,
• wherein the device comprises a single package that houses the processor, the memory, the first and second buffers, the first and second ports, and the first and second transceivers.