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Physicists May Have Found a Hard Limit on The Performance of Large Quantum Computers (www.sciencealert.com)

submitted 11 months ago by [email protected] to c/[email protected]

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A newly discovered trade-off in the way time-keeping devices operate on a fundamental level could set a hard limit on the performance of large-scale quantum computers, according to researchers from the Vienna University of Technology.

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[–] [email protected] 3 points 11 months ago

It isn't expected that a quantum computer will be able to instantly break symmetric encryption, as is used in full disk encryption. It will give an enormous advantage (halving the number of bits of security) but attacking that will still require a large amount of time and energy. What a CRQC will very quickly break is the asymmetric primitives, as used in TLS, encrypted email and chats, etc.

On the other hand, using default parameters from not so long ago, it is cheaper than you might expect to brute-force your disk passphrase already today without a quantum computer... which is why you should use a stronger key derivation function (in addition to a strong passphrase, of course).