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.

    Kramers-Kronig receiver
    85.
    发明授权

    公开(公告)号:US10797800B2

    公开(公告)日:2020-10-06

    申请号:US16308997

    申请日:2017-06-08

    Abstract: A Kramers-Kronig receiver that may include a reception path; wherein the reception path may include a photodiode that is configured to receive a received signal and output a photocurrent that represents the received signal; wherein the received signal comprises a continuous wave (CW) signal and a modulated signal; wherein a frequency gap between the CW signal and the modulated signal is smaller than a bandwidth of the modulated signal; an analog to digital converter that is configured to generate a digital representation of the photocurrent; and a digital processor that is configured to process the digital representation of the photocurrent to provide a reconstructed modulated signal, wherein the processing is based on a Kramers-Kronig relationship related to the received signal.

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