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Australia moves to drop some cryptography by 2030 – before quantum carves it up
(www.theregister.com)
this post was submitted on 18 Dec 2024
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The notion that quantum computing will make encryption useless anytime in the near future is a wild fantasy.
Yes, the potential exists that a fully realized version of quantum computing might do this. If such a thing actually ends up existing anytime soon. That is a big if. Right now we're still very much in the "Working out if this is even feasible" stage.
Even if fully realized quantum computers become a thing, and do all the things we want them to do, we'll be decades away from having enough of them to be able to apply quantum compute time to any random conversation on the off chance it contains something important. That's like fishing by hocking gold bars into the ocean in the hopes that one of them hits a fish on the way down.
It doesn’t really matter that it’s still a long time away, once it arrives all previous messages could potentially be decrypted. Messages can be intercepted and stored, and I would bet a lot that an organization like the NSA does this. Feels to me like it’s more of a better be safe them sorry thing.
Again, what you're not clocking here is that it will be a very, very long time before we have sufficient quantum compute time available to engage in large scale decryption. Even just getting to the point where they can decrypt all newly generated messages will be a long time. By that point you'd have decades of historical messages to did through.
Barring some wild, out of nowhere leap forward in the feasibility, scalability and affordability of the tech, you'll be dead by the time the NSA gets around to reading your old messages.
But they don’t have to dig trough all messages though. They can target specific people or organizations. And the fact that there is a possibility that this happens within the next 50 years, is a concern for spy agencies and other organizations with sensitive data.
There are encyption methods in existence that are resistant to any likely implementation of quantum computing as it's now understood. It may be that, in the future, quantum computing is developed to be better able to crack those ciphers, but it's equally likely that other methods of encryption will be developed that are even more resistant to quantum cracking.