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China claims supercomputer crown

A billion of these supercomputers would still take 10^40 ish years to crack a 256bit key, assuming the password was strong. I'd imagine they use it for physics or chemistry simulations.

Much more applicable to public-key cracking though i.e factoring numbers, which in many systems protect the exchange of the 256-bit symmetric keys. I bet it could munch through RSA keys quite nicely, certainly edging towards breaking 800+ bits in reasonable time. I'm sure it has much more innocent uses though :)
 
What are supercomputers actually used for i know the general uses of them but what specifically needs 2.5 thousand trillion calculations every second?

They are used for computationally/mathematically intensive algorithms, such as predicting weather patterns, cryptography, medicine or any other problem that needs extensive amount of numerical analysis. The trillions more calculations per second mean we can solve more problems (both bigger and faster).
 
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