Anti-spoofing defense system for a can bus

    公开(公告)号:US10915630B2

    公开(公告)日:2021-02-09

    申请号:US16776535

    申请日:2020-01-30

    Abstract: A method includes identifying an impersonating message, transmitted over a Controller Area Network (CAN) bus by an attacking node connected to the bus, that appears to originate from a source other than the attacking node. The method further includes, in response to identifying the impersonating message, driving the attacking node into an error-passive state in which an ability of the attacking node to communicate over the bus is limited, relative to before entering the error-passive state. The method further includes, subsequently to driving the attacking node into the error-passive state, driving the attacking node into a bus-off state in which the attacking node cannot communicate over the bus, by transmitting, over the bus, a plurality of passive-error-flag-trumping messages that collide with, and trump, respective instances of a passive-error flag that the attacking node transmits over the bus. Other embodiments are also described.

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