[ntp:hackers] A stop-gap authenticated time service

Magnus Danielson magnus at rubidium.dyndns.org
Mon Nov 9 22:12:12 UTC 2015


On 11/09/2015 08:22 AM, Poul-Henning Kamp wrote:
> --------
> In message <563FD918.7050806 at rubidium.dyndns.org>, Magnus Danielson writes:
>> You can still yank it with asymmetric delay attacks.
> Read again :-)
> I don't look into the RTT at all (for that and other reasons).
> What you can do is increase my uncertainty window.

RTT would actually give you a hint about what is going on.
If you create a slowly increasing asymmetric delay, very slow. That 
phase ramp on your experienced delayed timestamp shifts your apparent 
time. It will appear as if your local oscillator had that frequency error.


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