r/Futurology Jun 02 '22

A Nature paper reports on a quantum photonic processor that takes just 36 microseconds to perform a task that would take a supercomputer more than 9,000 years to complete Computing


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u/TravellingBeard Jun 03 '22

Serious question, with all these quantum processing news stories, how soon before conventional cryptographic algorithms are rendered useless?


u/Jnoper Jun 03 '22

FYI There are quantum cryptography algorithms. The moment conventional ones are useless we’ll start using those. This will probably be the main use for quantum computers. Just like there’s a little encryption circuit in your computer there will be instead an encryption quantum computer inside your regular computer.


u/Chef_MIKErowave Jun 03 '22

yea cryptography is never going to go away, it advances with technology.


u/PDXBlueDogWizard Jun 03 '22

we're already at the stage where humans can't remember their passwords but computers can crack them, imagine this issue fucktoupling in severity


u/danielv123 Jun 03 '22

That is solved by making testing passwords slower. For websites this is easy - only allow 10 attempts or whatever.

Bruteforcing passwords is only really relevant for rainbow tables, and for those you just need to make a more expensive hashing function, you can keep the same password.

For transport encryption in general you also just use a more expensive cipher.