We’re introducing a new series on CAN and automotive hacking. First, we’ll introduce CAN and discuss how in-vehicle networks work. In Bosch introduced the Controller Area Network protocol.
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From Wikipedia, the Controller Area Network (CAN) bus is a "vehicle bus standard designed to allow microcontrollers and devices to communicate with each other.
Modern Vehicles all come equipped with a CAN-BUS Controller Area Network, Instead of having a million wires running back and forth from various devices in your car.