Decoding military stuff? That does not sound good. Sounds like technology that should be kept out of the hands of certain people or countries.
As someone pointed out, the encryption would have to radically change and quickly to a Quantum level encryption whatever that is....
but one nation having the ability to break the military grade encryption in minutes would give that country a huge strategic advantage for a period of time...
Think back to WW II, the US and it’s allies broke the Japanese Naval Code and using a captured German Enigma machine could listen all the German military communications in real time.....