France is about to pass the worst surveillance law in the EU.
France is about to pass the worst surveillance law in the EU. We must stop them now! | Tuta
cross-posted from: https://lemm.ee/post/56769139
cross-posted from: https://sopuli.xyz/post/23170564
Its funny, I'm watching this show called Prime Target and basically the NSA is trying to prevent people from figuring out some sort of mathematical equation that would instantly break all encryption and talking about how it would be the end of the world as we know it.
Meanwhile the EU is forcing everyone to put in an express lane IRL.
I haven't seen that show, but it sounds like it has a basis in reality: there has been a real concern that quantum computers might be able to break much of current encryption because they are far quicker than classical computers at problems like finding the prime factors of a number, and widely used schemes like RSA encryption depend on that being hard to do. And that could be fairly catastrophic, not only for current communications and for data encrypted at rest, but because communications data can be collected now and decrypted later when the technology becomes available. As far as we know, no one has done it yet, but quantum computers are developing rapidly so the day may well come. So there's a reason to move to encryption algorithms that are hard for quantum computers, even before such computers become a practical reality.
They do talk about quantum computing in the show in a different context, saying it's still a decade away. Their tech has something to do with Prime numbers (hence the title).
But also several companies already advertise "quantum resistant encryption" for whatever that's worth.
I'm no cryptographer, so take this with a good heap of salt.
Basically, all encryption multiplies some big prime numbers to get the key. Computers are pretty slow at division and finding the right components used to create the key takes a long time, it's basically trial and error at the moment.
If you had an algorithm to solve for prime numbers, you could break any current encryption scheme and obviously cause a lot of damage in the wrong hands.
Basically, all encryption multiplies some big prime numbers to get the key
No, not all encryption. First of all there's two main categories of encryption:
The most widely used algorithms of asymmetrical encryption rely on the prime factorization problem or similar problems that are weak to quantum computers. So these ones will break. Symmetrical encryption will not break. I'm not saying all this to be a pedant; it's actually significant for the safety of our current communications. Well-designed schemes like TLS and the Signal protocol use a combination of both types because they have complementary strengths and weaknesses. In very broad strokes:
This is crucial because it means that even if someone is storing your messages today to decrypt them in the future with a quantum computer they are unlikely to succeed if a sufficiently strong symmetric key is used. They will decrypt the initial messages of the handshake, see the messages used to negotiate the symmetric key, but they won't be able to derive the key because as we said, it's safe against eavesdropping.
So a lot of today's encrypted messages are safe. But in the future a quantum computer will be able to get the private key for the asymmetric encryption and perform a MitM attack or straight-up impersonate another entity. So we have to migrate to post-quantum algorithms before we get to that point.
For storage, only symmetric algorithms are used generally I believe, so that's already safe as is, assuming as always the choice of a strong algorithm and sufficiently long key.
That's a comment I was hoping for, thanks :)
Yep that's kinda how they explained it, too.
