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I think modern society going down is a bit of a stretch here. There are quantum-resistant cryptographic algorithms that would be safe even against quantum compu

• Robotbeat 9y ago
  However, EVERYTHING has to switch over before it happens. Everyone has to change all their passwords and security questions and private keys. Additionally, anything sent over the Internet via ANY of the standardized public key encryption algorithms can be skimmed and stored right now and decrypted once quantum computers are available. Social security numbers, bank account numbers, credit card numbers, security question answers, tax returns, trade secrets, personal details, Signal messages between elected officials and/or dissidents, informants, etc... All in clear text to anyone with forethought to start storing it right now. Changing to a quantum resistant algorithm doesn't change the past; it doesn't change data that has already been archived. That's why Quantum Jubilee is going to be such a big deal. Not only do you have the usual slowness in deploying new encryption standards (thus likely exposing industrial equipment, etc), but everything being sent right now is already at risk. And we don't know when it'll happen. Could be 5 years from now, could be 15. Could have already happened in secret (unlikely, but still possible).