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> Technology from the future will be able to break today's encryption in a heartbeat

I don't believe that's necessarily true. IIRC, certain algorithms would require computations involving every particle in the universe, operating for billions of years, to brute-force, provided that they are not actually broken. Will every current algorithm eventually be broken? Probably—but if not, they should be good.

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Many of our current encryption algorithms can be broken by sufficiently powerful quantum computers [1]. We're still a while off from usable quantum computers, but they are coming, eventually.

[1] https://en.wikipedia.org/wiki/Post-quantum_cryptography

Symmetric key encryption is resistant to quantum computing, you just need to double the key size

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