A system and method for providing security to a network may include maintaining, by a processor, a model of an expected behavior of data communications over the in-vehicle communication network; receiving, by the processor, a message sent over the network; determining, by the processor, based on the model and based on content in the message, whether or not the message complies with the model; and if the message does not comply with the model then performing, by the processor, at least one action related to the message.