Originally Posted by transmitterdan
The relevance is that a radio hacker can make an ECDIS think a collision is in the offing. What's to be gained from that ability isn't clear though a lot of hackers don't get any obvious benefit from their activities. But this news may convince some rec boaters to delay implementing AIS and that would be a shame.
Firstly you have to be within VHF range , then you give your location away by starting up a VHF transmitter , thirdly big ships use Marpa for collision avoidance not AIS. ( many ECDIS don't even show AIS targets )
Even if you went to the bother , all that would happen is you'd generate a false AIS collision alarm
, rapidly disabused by MARPA and mark 1 eyeball.
Then you'd report it To the authorities , who usually a simple VHF directional finder , hunts down the VHF site on land and cuffs the hacker.
The fact is an public ID beacon must be , by definition , in plaintext. Encryption is useless , if everyone can buy receivers and transmitters.
Just review the Trend micro claims
( a) hacked marinetraffic,com -who cares
(B) generated false AIS mob
, well I can do that simply by driving into a forest and setting off my AIS sart , unless there happens to be a big ship with VHF range of my forest , what happens , nada
(C) I send telecommands to disrupt AIS on board receivers , this I give you is an issue, even though all I do cause class A units to switch channels, all ships still receive, I can change the reporting rates , but not below the technical minimum , so in reality I can cause a little nuisance but not much more and to do that I have to establish , a local VHF AIS transmitter that promptly gives my position away !!!! Anyway I can easily cause a " Denial of service
" by just jamming the AIS frequency , I dont need any fancy SDR for that !! N