[time-nuts] DHS Resilient PNT Conformance Framework

[Magnus Danielson]

Hi,

Yeah, so that is why from bitter experience, that needs to be
recoverable by users in the field. To put it mildly, a pilot flying a
plane will for sure like to be able to restart a malfunctioning device
for sure. Sure, it can take a few minutes, but being able to recover to
a known state with a known command (similar enough to the three-finger
salute of Ctrl-Alt-Del) is worth plenty. Loosing the capability to
navigate for the rest of the flight and in fact ground the plane until
unit can be replaced is.... something they want to avoid for sure.

I think we all are happy that then do not think it's a good idea to take
an instrument out, attach JTAG and reprogram it with a flimsy Windows
laptop mid-flight. Right? Right.

Cheers,
Magnus


On 2020-12-17 23:55, Bob kb8tq wrote:
> Hi
>
> Gee, GPS modules that go nuts and stay nuts after getting hit with this or that.
> I haven’t seen any of that since I retired …. :)
>
> Bob
>
>> On Dec 17, 2020, at 5:30 PM, Magnus Danielson <magnus at rubidium.se> wrote:
>>
>> Hi Bob,
>>
>> Yes, there is that too. NIST insisted to have me involved, so I got
>> involved.
>>
>> This is pretty high level, because it was needed, but many low-level
>> details was discussed and then we backed out with that common ground.
>> Some of the IT-security approaches does not really work on the
>> RF-interface. It's not that it can't be hacked, but it works so
>> differently and with much lower bit-rate... and one-way, that the
>> security analysis becomes quite different about how attacks can be done.
>> After that we concluded it's good to mention, but this is not relevant
>> for all interfaces. :)
>>
>> There is many ways to achieve the different levels, but we wanted to
>> make a number of key rules to sort things out, they form a form of
>> minimum set of requirements. Normal receivers achieve level 0.
>>
>> Some receivers "hang" after being upset by some input. "hang" to the
>> level it needs vendor intervention. So one learning is that the user
>> must be able to force the receiver into a "known state".
>>
>> Cheers,
>> Magnus
>>
>> On 2020-12-17 19:50, Bob kb8tq wrote:
>>> Hi
>>>
>>> Pretty suspicious looking list of contributors. Very much so about half way
>>> down the list :) …. congratulations !!! ( I guess …)
>>>
>>> Bob
>>>
>>>> On Dec 17, 2020, at 12:52 PM, Magnus Danielson <magnus at rubidium.se> wrote:
>>>>
>>>> Fellow time-nuts,
>>>>
>>>> DHS just published the work on Resilient PNT Conformance Framework, that
>>>> has been in the works since last year. This is intended to be the
>>>> framework for which multiple sectors align their standards, and a wide
>>>> range of interest was involved.
>>>>
>>>> Hope it can be interesting reading for you.
>>>>
>>>> https://www.dhs.gov/publication/st-resilient-pnt-conformance-framework
>>>>
>>>> Cheers,
>>>> Magnus
>>>>
>>>>
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