Apparatus for providing security to an in-vehicle communication network having a bus and at least one node connected to the bus and having software responsive to which the node performs operations, the apparatus comprising: a first module configured to be connected to the at least one node and generate and transmit a hash of at least a portion of the node software in response to receiving a challenge; and a second module configured to be connected to the in-vehicle network and transmit a challenge to the first module requesting that the first module generate and transmit a hash of the at least a portion of the node software to the second module; wherein the second module is configured to determine if the hash received from the first module is generated responsive to a correct version of the node software.
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