[Cryptography] Hacking spread spectrum clocking of HW ?

Henry Baker hbaker1 at pipeline.com
Wed May 25 13:25:01 EDT 2016


At 11:44 PM 5/24/2016, grarpamp wrote:
>On 5/24/16, Henry Baker <hbaker1 at pipeline.com> wrote:
>> https://www.maximintegrated.com/en/app-notes/index.mvp/id/1995
>>
>> Q: How hard is it to diddle with the spreading codes on these clocking
>> sources?  I'd like to experiment with some longer codes.
>
>See their spec sheet...
>
>https://datasheets.maximintegrated.com/en/ds/DS1086-DS1086Z.pdf
>
>I looking for links to different whitepapers... where dither driving the spread is not pretty triangle frequency and amplitude, but is a random shared key.
>
>And it's driving an RF tx/rx capable of extremely wide spread range.
>
>Other option is to tx/rx faux wideband noise modulo a random spectrum key.
>
>Pointers?

Thanks for the link.  This particular chip can be hacked, but perhaps not enough.

It's possible that none of the existing 'spread spectrum' clock chips can be hacked enough.

In that case, it may be necessary to 'emulate' one using a free-running state machine -- perhaps synchronized in some way (phase locked loop?) to a low frequency time standard.




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