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Signal-level Security

Discussion in 'Electronic Design' started by Vibhav, Oct 17, 2006.

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  1. Vibhav

    Vibhav Guest

    I mean protection for the data transferred between components on a PCB,
    against access from someone who has physical access to the board. As
    an example, there is a data bus between the baseband and a FPGA.

    Is there a method to prevent someone who has access to the board, from
    reading the data on that bus using a scope?

    Thanks for your assistance.

  2. MooseFET

    MooseFET Guest

    You have three not very good options.

    You can encript the data if it is digital. This adds a bunch of
    electronics to the two ends of the path.

    You can make the meaning of the signal so obscure that no-one ever
    figures out how to decode it. This very hard to do because 6 billion
    people are working agaisnt you.

    You can use "quantum encription". Basically you send the data with a
    very poor SNR and lots of error correction codes and require that the
    error rate remain in the predicted band. This can be very secure but
    it requires a two way connection and is slow to get the data through.
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