Can you find how many qubits are needed to reliably break SHA256?
At the current rate of quantum computing development how much longer is bitcoin safe, assuming billions of dollars being spent on a quantum computer and keeping in mind the best ones existing today only cost 10s of millions?
I read somewhere that SHA256 is much more difficult for quantum computers than Elliptic Curve, perhaps impossible...why is this? How much more difficult?
How many qubits are needed to reliably break Elliptic Curve using a public key?
Yes I realize there is plenty of material written about how bitcoin code can be updated, or other reasons quantum computers are not a concern, but the point here is that the community needs to know about when this risk will happen and be prepared. It could be sooner or further away than we expected and everyone's finances should not be caught off guard. This post is about when bitcoin should expect a risk, not gauging the risk (unless it is zero)
A Grover search could work against Bitcoin's “hashcash” proof-of-work, they write, but it would be slow: The extreme speed of current specialized ASIC hardware for performing the hashcash PoW, coupled with much slower projected gate speeds for current quantum architectures, essentially negates this quadratic speedup, at the current The DWAVE system often written about in the press is, even if all their claims are true, not a quantum computer of a kind that could be used for cryptography. Bitcoin's security, when used properly with a new address on each transaction, depends on more than just ECDSA: Cryptographic hashes are much stronger than ECDSA under QC. Bitcoin is a distributed, worldwide, decentralized digital money. Bitcoins are issued and managed without any central authority whatsoever: there is no government, company, or bank in charge of Bitcoin. You might be interested in Bitcoin if you like cryptography, distributed peer-to-peer systems, or economics. Subscribe to The Chico Channel--Disable the NSFW warnings that refer to content considered inappropriate in the workplace (Not SNSFW warnings that refer to content considered inappropriate in the workplace (Not S The DWAVE Computers that are being built all over the world, along with the 5G Technology they need, not to run, they are already functioning. He was like a flash that just happened, started saying a lot of important, ground-breaking things, and then seemed to disappear into silent exile. As far as I know, Gordie Rose is alive and well
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