Removed the ability to communicate cryptographically. Our only tool.

Not entirely. The old methods still work. I’m talking about old fashioned pen and paper. OTP ciphers and dead drops. Messages, hidden where only the intended recipient knows it’s there. The problem is, there’s no dead drops in cyberspace. There’s no place one can leave a hidden message that can’t be seen by others in cyberspace. And while quantum computing might break OTP, it’s too expensive to use for that purpose.