Re:The phones of Ukrainian president Zelensky
by bob1029 on Tuesday March 29, 2022 @09:00AM
(#30841945)
This is why militaries like to use DSSS communication technologies. It makes detection by these kinds of systems very difficult. The state of the art is offline processing of recorded "noise" on HPC server farms. In a "launch/guide missile" context, this is way too late, even if you find a coherent signal.
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Re:The phones of Ukrainian president Zelensky
by rasz on Tuesday March 29, 2022 @05:41PM
(#30848752)
This was true probably up to Iraq war. Good example http://www.milspec.ca/radspec/prc-343.html https://www.cryptomuseum.com/radio/selex/prr/index.htm Ordinary DECT home cordless phones could be considered as secure at the time :)
Nowadays we have enough compute power in a laptop with connected SDR to render this moot security by obscurity.
Re:The phones of Ukrainian president Zelensky
by bob1029 on Tuesday March 29, 2022 @06:04PM
(#30848972)
> Nowadays we have enough compute power in a laptop with connected SDR to render this moot security by obscurity.
Can you provide some sort of example of how a laptop+SDR was used to discriminate something equivalent to a military-grade DSSS signal (i.e. one in which the pseudo noise function and its parameters are classified)?
If you know the PN function, I agree that it is trivial to detect/recover the transmission.
Re:The phones of Ukrainian president Zelensky
by rasz on Tuesday March 29, 2022 @07:09PM
(#30849511)
USRP came out in 2005. Nowadays wide coherent multi radio SDRs are readily available in portable form factor. Beginner setup (sadly limited to <1.8GHz) started shipping recently https://www.crowdsupply.com/krakenrf/krakensdr
https://www.youtube.com/watch?v=z9RkPt6uVQ4 now add ability to do phase correlation