Hacker News new | ask | show | jobs
by londons_explore 1428 days ago
The crypto for US military GPS uses the same keys worldwide, and rotated ~ weekly. That means if you capture any device which has the crypto keys, then you can spoof military GPS for the rest of the week, allowing you to do lots more damage.

Therefore, the military often doesn't even use the keys in their own devices.

1 comments

How do you know this?
It's in the published specs of the satellites. They have a whole key schedule bit.