Topic: how many more years our bitcoins will be save from quantum supercomputer - page 2. (Read 542 times)

Potentially true, but the mining improvement is much smaller than we might anticipate. The biggest advantage of a QC is using Shor's algorithm to break asymmetric cryptography. This isn't an approach that can be used for mining - the QC advantage here would be that PoW can be exploited using Grover's algorithm. IIRC that's only an advantage over classical of a couple of orders of magnitude. Big, but not huge.

What I worry most is years of nosense talk of those fake quantum computers would make btc community so insensitive that no action would be taken when true threat arriving.

Quantum supre computers are the main challenges associated with bitcoin but i believein the near future, we will have some tech gurus using the saem computers that once served as challenges to compute to also become the major source of solutions to computers related challenges on the bitcoin network

This is certainly true for us as individuals right now... but there is a large quantity of bitcoin in reused addresses, and there are plenty of coins that are effectively lost. When bitcoin forks to deal with the quantum threat, all coins will need to be moved to new, quantum-safe addresses. Those that aren't moved or can't be moved can then be stolen by a QC running Shor. Admittedly we don't have QCs capable of this right now, but the field is advancing rapidly, and because of superposition and entanglement QC processing power scales 2^n, so if you go from say 9 qubits to 10, the capability doubles... which is quite counterintuitive from a classical perspective. I'm not trying to be alarmist, and there are certainly engineering challenges to overcome with larger QCs, particularly in maintaining coherence, but the time will come when we're forced into a choice of whether to burn any coins that aren't moved by a given date, or else leave them to be stolen. Neither option is great, and I assume both would be hugely contentious. Achieving a consensus on this would I'd imagine be quite a challenge.

As a side note, ignore DWave and similar. These are annealers rather than universal gate QCs; they have a specific use case, and won't be running Shor's alogrithm. DWave is not a threat to bitcoin.

If you're not an expert in this topic, then why do you assert that "QCs are nothing but FUD?"

1. You cannot protect outputs which requires an ECDSA signature to unlock. They are inherently vulnerable.

2. A successful attack will most likely not be detectable. Siphoning funds slowly from exposed addresses would be pretty much undetectable, given that people would go with the suspicion of a having malwares, etc and if the knowledge of a QC technology is concealed well enough, it could be quite a while before the community catches on.

Perfect opportunity to quote myself here because the question and topic of QC
comes up a lot on the forum and so all questions have been answered already.

Why try attack the network with a QC when you could HELP the network and mine
Bitcoin, your QC would out perform all others!

All the theories about quantum computers and Bitcoin are nothing but FUD...
Quantum computers are simply being used as a "scarecrow" by all the FUDsters and Bitcoin haters.
"Don't buy Bitcoin,because after X amount of years,a quantum computer will destroy the Bitcoin Core blockchain and your Bitcoins will be gone."This is the main narrative.
There are two things to be considered:
1.The Bitcoin Core blockchain is not static and can be/will be improved.
2.A potential successful attack will crash the Bitcoin price to unprecedented lows,which makes the attack unprofitable.
Two 2 factors make a possible quantum computer attack pointless.
By the way,I'm not an expert in this topic.

Bitcoin is way up ahead of supercomputers, if bitcoin can defeat most government policies that most countries are reversing their ban on it,I don't see how supercomputers can in any way hold it down,but rather it will bow to bitcoin like every other that have been against it ends up bowing

That’s not a thing to be worried about for now, because Quantum computers are not yet out and widely being used, for now. And when it comes out, it’s going to take a lot of years before you will start seeing them as you would a regular computer. And moreover, I have this feeling that by the time Quantum computers comes out there will be people who will still figure out a way to get pass all the problems that it brings with it.

And next, I don’t think there is going to be any problem except if it’s illegal in your country for anyone to be making use of cryptocurrency, that’s when you might be having such issues. And then from what I have understood, for anyone to do something to your coins with such a computer, they will need to have your address, that’s why it’s good to secure every bit of your information.

Quantum computers are already available, but not for personal use. And besides, those computers are not your conventional PCs that run on normal processors anyway, so the configuration and its possible application on computing as we know it will be entirely different. It will take decades before we even land on an age wherein quantum computers are readily available for personal use. And even then, we might have transitioned into an algorithm completely safe from quantum computing. There really isn't much of a threat when it comes to quantum computers and bitcoin IMO. Even when quantum computers are treated as PCs of today, I doubt people would even think of using those to mess with bitcoin.

the threat has not been proven until now, we can see several times bitcoin has problems that can destroy it but until now bitcoin is still there and continues to experience price increases from year to year. Bitcoin is not easily destroyed because if there is a serious problem, the community will not be silent and they will definitely do something to prevent the destruction of bitcoin.

I've never seen a flying car but quantum computers? Definitely.

Quantum computers are not conventional/classical computers and you can't measure it as such as they're not designed to function similarly. You're talking about qubits which has been successfully with quite a few QCs, from IBM, Google and DWave. We're more interested about specific application of it in the field, Shor's algorithm, Grover's algorithm for example. They are designed to work with quantum computers and would produce more efficient results. Quantum physics is a proven science.

It won't affect any of our crypto assets because we already see how those big names are now involved in this industry, they are not jokers they really mean it when they started their journey to hodl their first BTC. These people have their own personal investment advisers whom they can count in terms of this issue and they don't really count this quantum thing as a threat since we only have right now are mere theories and myths.

Bro it depends, I don't think someone can predict the actually or specific time all these can happen, anyone pronouncing time it will happen, I don't think it will be accurate in some extent.

computers and its parts are cheap now .
 is this not enough to  build a super computer ? maybe it isnt but thats a good news to btc users because the safety for our btc is extended but soon the time will come that computer and its parts are going to get more cheaper but before that happens i guess btc developers and its team will release a solution .
something that can make btc become more resistant to super computers and other deadly threats .

I am hearing about this quantum computer boogeyman for years and how it will destroy Bitcoin, there is even some cult like coins with only purpose to protect against imminent quantum attack that may never happen during their lifetime.
If Bitcoin is going to be affected by something like quantum computers than everything else will be affected including banks and almost every other electronic devices, so BTC will be the least of your worries.
If we look in distant future, maybe next 30 or 50 years we can say that Bitcoin forks are very likely to happen for various reasons and I would not be surprised to see one that will improve code and make it quantum resistant.
Problem with quantum computers is that they can only do one single task, they are not so smart as you may think and they are not even near mass production.

Your number is pretty low, in 5 years, I am pretty sure that it won't even be publicly available because it will be expensive and it will only be used for academic, scientific and military purposes. Plus, bitcoin's code and security is quite impervious so I don't think that quantum computer is going to be able to make a dent against it and if we ever come to a point where a vulnerability is discovered, they would probably do a hotfix.

Quantum supercomputers are the new flying cars.

Some say they will someday be a reality. But there is no evidence of it.

An 8 cylinder engine might produce 500 horsepower. A child might look at this and announce plans to build an 8,000 cylinder engine that produces 500,000 horsepower.

An intel core CPU might produce 500 giga flops on average on 64 bits. A child might look at this and announce they built a "quantum supercomputer" that runs on 64,000,000 bits producing 500,000,000 GFLOPs. In the case of announced quantum computers the actual result is far less than 500,000,000 GFLOP (as the technology doesn't scale).

If someone bothered to read some of the whitepapers on "achieving" quantum supremacy. This is the type of thing they might see. "Quantum supercomputers" with more than 100,000 bits that don't even run. Which in theory can produce astronomical levels of performance simply by scaling upwards.

The problem is not with quantum computers breaking a code. The problem lies in coding the existing software into a language understood by a quantum computer and then translating the results back from quantum data to binary.

If you could do it fast and easy then a quantum computer would already be a threat to every single encryption available in the world.

Don't you think that there are more important things for countries to protect from quantum hacking like missile launch codes, satellite controls and intelligence messages?

There are already core developers working on quantum cryptography to add as a layer to the bitcoin's blockchain. So no worries I think, I cant say I don't have any doubts about it tho.