how many more years our bitcoins will be save from quantum supercomputer

[veznata]

Hello. Quantum supercomputers and other serious threats to bitcoin have been widely talked about lately. from what I read on the net it is clear that so far there is no problem, but .... my short question is how long we will be calm that one day we will not wake up without anything? 3-4-5 or how many more years? I will be glad to hear your opinions.

[Lorence.xD]

If we can buy quantum computers as a Personal computer then we can probably safely assume that our bitcoins is going to be not safe in terms of security but it will be difficult for quantum computer to brute force bitcoin no matter how fast we can imagine it.

[SquirrelJulietGarden]

When Bitcoin has rises, questions about threats from quantum computers appear. I am not expert and can not make a thesis to prove Bitcoin private keys are safe in many more years.

Experts say it is safe and I believe in them. I think if there are bigger threats from quantum computers, the Bitcoin developers can upgrade the Protocol with consensus from community.

In normal conditions, community can be separated but when threats come, they will reunited and make what needs to be done.

[ropyu1978]

bitcoin has long been attacked by a new type of supercomputer, although supercomputers are looking for a thousand ways to destroy weaken and drop bitcoin, I believe they will not be able to, their efforts will definitely be in vain, because I believe bitcoin will be safe, up to 20 or so. The next 30 years ... maybe until I get old ...

[o_e_l_e_o]

Quantum computers are not some magic device which will allow the owner of one to steal bitcoin at will.

The concerns regarding quantum computers are that they can theoretically provide an exponential speed up when considering the process of reversing elliptic curve multiplication, and therefore calculating a private key from a known public key. They can't just hack any given address or any given wallet.

Since the public key of your address is only revealed if you either chose to reveal it, sign a message from that address, or make a transaction from that address, then if you do none of these things, your bitcoin remain safe against quantum computing for decades more. What that means in practice is to simply to avoid address reuse. Do this and by the time quantum computing is a concern for you, we will have long ago moved to quantum resistant algorithms.

[bosede1]

"my short question is how long we will be calm that one day we will not wake up without anything" the answer from my point is that we will continue to sleep and wake up with the assurance that all coins will still be intact.

[lifeforcepools]

Enough to make you crypto rich. Be sure of that.

[swogerino]

Quantum computers that can break the Bitcoin algorithm are years distant from now.Bitcoin price if you hold now until 2025 will make you rich as the value is expected to skyrocket.

[cheezcarls]

There are even rumors that a fully-functional quantum computer has the capability of finishing all BTCs to be mined instead of waiting for the year 2140. I believe that someone out there are already building something for BTCs and other cryptocurrencies to be quantum resistant.

[target]

When Bitcoin has rises, questions about threats from quantum computers appear. I am not expert and can not make a thesis to prove Bitcoin private keys are safe in many more years.

Experts say it is safe and I believe in them. I think if there are bigger threats from quantum computers, the Bitcoin developers can upgrade the Protocol with consensus from community.

In normal conditions, community can be separated but when threats come, they will reunited and make what needs to be done.

It's part of the shill that gets old already but they keep reviving because it's still working for newbies in Bitcoin. If it would really work, the government could have used it already to destroy Bitcoin market but nope, they sure aren't doing it and that is because it doesn't work.

Bitcoin now is the safe haven of the companies and rich individuals wanting to preserve their wealth, they can't stop it anymore.

[Upgrade00]

Before quantum computing would negatively affect the security of the Bitcoin network, it would have already successfully breached a lot of other industries and sectors, as Bitcoin has a far stronger security than most sectors.

So if we are imagining a futuristic scenario where technology has advanced to possibly breach the security of Bitcoin we should assume that all networks built on the internet has been potentially breached, including other assets or forms of storing wealth.

[DooMAD]

One of the few things banks do get right is their marketing spiel.  Just about every article on the internet regarding quantum computing and banking is a list of advantages and positive messages about all the benefits it will supposedly bring.  Conversely, just about every article with quantum computing and Bitcoin is the complete opposite.  Nothing but dire consequences and doomsday scenarios.  As a result, everyone seems to think the money in their bank is totally safe and that Bitcoin is somehow more vulnerable.  I've been in bank branches where staff have admitted they still use DOS-based applications, which are 30+ years old now.  Hell, I work in insurance, a financial services industry.  My company still uses DOS-based applications.  Let's stop pretending that banks are going to adapt to a change in technology more rapidly that we are.  The idea is laughable.

[ranochigo]

None of the replies actually answered your question.

Estimates puts it at after 2030, there could be a quantum computer that is capable to break an asymmetric cryptography, which is the ECDSA that Bitcoin uses. These are just purely estimate and currently, the highest known qubit count of a quantum computer is less than 100 (or somewhere thereof). You need more than 1200 qubits to be able to factorize it within a reasonable period of time and even that comes both in the huge cost of building one as well as running it. Bitcoin won't be the first to be attacked, it is just not profitable.

[franky1]

If we can buy quantum computers as a Personal computer then we can probably safely assume that our bitcoins is going to be not safe in terms of security but it will be difficult for quantum computer to brute force bitcoin no matter how fast we can imagine it.

true quantum computers need sub zero temperatures and in fixed locations with no vibrations or ambient sounds..
your not gonna have a desktop quantum.. sorry.. but no

the closest you will get from a home PC is 4gate transistor tech rather then native binary 2gate
but before thats even a thing they have to make the stuff and the chip firmware and then the operating system and then the software. so dont plan anything soon

as for how long..

quantum computers are great at problem solving things that are not binary.
things like 3d vectors and multidirectional rout planning.
putting a binary problem into a quantum computer where the solution and path to the solution need to follow binary rules for a binary commuter to then accept it as the solution. causes a quantum computer to not be able to have all its freedoms of dimensions/gate utility.

so all that ends up happening is it processes at 2x speed.
basically using one 'bit' which can represent 0123. instead of binary needing 2bits to represent 0123

so if you have a 32bit bitcoin mining asic chip
its like having a 16bit QC chip
so a ASIC with 100 chips.. is like 3200 bits

all in all.. dont worry too much. QC wont be replacing mining any time soon. or brute forcing bitcoin signatures

[hatshepsut93]

Bitcoin uses the same cryptography that your bank uses, that the military and government uses and so on. So, theoretically it could do way worse than stealing your bitcoins. But cryptographers have developed quantum-resistant cryptography decades ago, so far it's not being widely adopted because it could be slower than the current standards, or not yet as tested as other algorithms. Eventually a new quantum-resistant will emerge, and I'm sure it will happen long before quantum computers will be a real threat.

You really shouldn't worry about such distant future and instead focus on securing your coins against malware or $5 wrench attacks.

[SystemTrader]

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.

[pixie85]

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?

[Hydrogen]

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.

[Obito]

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.

[dkbit98]

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.