Topic: Do you think quantum computers would break Bitcoin's security? - page 3. (Read 4168 times)

there are many quote that say otherwise, so no i'm not wrong at all, for a quantum computer brute-forcing a 256 key is like for a normal computer brute-forcing 128 key, it's like dividing by two(the exponent not the number, so is equal to a root square of it), this should be clear, and with that in mind you could deduce easily, that a 128 key for a quantum computer is equal to a 64 key for a modern computer, and a 64 key can be brute-forced with a normal computer(not just one i know, but a very big farm can do it)

just simple logic, you don't need to search for anything to deduce this...

I see no information about 128 bit keys being broken. Any information found on stackexchange has no guarantee to be correct. It confirms what I said. SHA can't be reversed; it has to be brute forced.
It clearly indicated that quantum computers are more powerful than the computers of today, which is logical. There is no information on there internet about this. You're talking out of a hat.
Yes 128 bit security is 18446744073709551616 times faster to bruteforce than 256 bit. This doesn't mean that it is vulnerable when used.

It's obvious that people are commenting without proper knowledge in quantum related technology. The computers are not nowhere near ready to do any complicated jobs. The main challenge in a Qcomputer is to make sure that the qubits are entangled (if you're familiar with Schrödinger’s cat you will know what I'm talking about; look that up). The computer must stay in this state (for the cat - it can't be simultaneously dead or alive) long enough to perform calculations and get results. The ones that we have can keep the state for miliseconds or maybe a couple of seconds. That's not long enough to do something useful.
To break encryption these computers must have 500-2000qubits. Existing quantum computers operate with 14 qubits at maximum.

I have not forgotten about D-wave though. The company D-Wave claims that it has produced a 512 qubit Qcomputer. That is not a real quantum computer because it uses quantum annealing effect and can't demonstrate full properties of one. It is basically set to do a few specific tasks and represents no danger to encryption.



To summarize: You're wrong. Existing implementations have not shown that they can beat 128bit encryption. They aren't even close. That's the current situation. I'm not saying that in 5 years we won't have better technology. We might operate with 1400 qubits or be stuck at 140. Nobody really knows.

This has been talked about a lot.  Quantum computers will not break Bitcoin's security.

But to put it in crude terms:  Quantum computers suck.  They worse than suck because if they sucked that would at least provide some benefit.  Quantum computers do nothing.  And they take a really long time to get that nothing done.  Quantum computing has been around for dozens of years now and still hasn't even done nothing.

And on top of that Quantum computers have the potential of sucking even worse.  In 10 maybe 20 years quantum computers will be wasting more time than all of our blank stares put together.

Yes obviously, we can't do nothing only sit and watch what will happen after the first quantum computer will be created and it will be fully functional. For the question of the bet, nah I don't like these type of thing and I can't imagine how we can bet (it's 10-15 years  ).



Here we are only speculate about an hypothetical quantum, so it may happen everything.

 Guys why are you wonder about that ? Don't worry coz if quantum computers to be invented and they try to hack blockchain, then blockchain will use quantum algorithm and will be secure

as i said dont worry. If technology improve at the same time blockchain will be improved itself.

They probably said that about MD5 and SHA1. Careful.

Yes and no.

Bitcoin encryption can easily be made countless times more difficult.

By the time quantum computers are capable of breaking the blockchain, Bitcoin encryption will have been made so extremely strong that regular computers will have a hard time just working with the encryption, but even quantum computers won't be able to break it.

Then, people will start getting quantum computers in their homes, and this will make Bitcoin encryption stronger than ever.

All this is a loooooong ways off. Lots of other things will have a much better chance of collapsing Bitdoin before quantum computers are ready to do it.

Its future anyways! Noone exactly knows what's happening in the future.. Hey redsn0w, the best option is to sit and watch (We can bet if you're interested )
What do you think?

Yes. If quantum computers become a reality (and there is serious question about that) then they would upend everything, including Bitcoin. Is that something to seriously worry about today? No.

Nah only  10-15 years. I think it will exist for the next (at least) 50 years, we should remember it was created only in the 2009 and I think it will be used for a long time.

Maybe not! 10-15 years and it will die.. Perhaps, it may die soon.. But since its already adopted by many people, it will take a while to die forever

You are rigtht, innovation will never stop but I think bitcoin will exist for another 50-100 years. Do you remember when internet was 'released' to all the people.... and we are still using it (waiting for a new protocol, better than this one).

Quantum computers could "theoretically" effect a number of industries including the banking sector. So bitcoins will be the least of our worries.

I'm really not worried so much, mainly because the same computing power could also be used to aid in creating stronger cryptology as well. There are a number of other countries including China, Russia and India, ect. who are not just sitting around waiting for their secure systems to be hacked by quantum computing.

There will be pluses and minuses on both sides of the table as we learn more about this technology and overall all we'll learn how to use it to make our encryption schemes even more secure.

If you're interested in such a matter just have a look to this site: http://pqcrypto.org/


Fascinating to say the least.

Yes! Innovation never stops! There are already better altcoins than Bitcoin out there! One of them will replace Bitcon in the near future! I see the future in altcoins Bitcoin was not the first digital currency and it won't be the last

I think yes. But at that point bitcoin may be the least of our worries.

Why? Do you think it will exist/created a new concept better than the actual bitcoin? I think the blockchain will exist for ever, it is an invention like internet and all we know it is extremely difficult to replace the internet protocol.

I don't think we will be using Bitcoin Technology until the quantum computer era starts... Just my personal opinion!

Thank you to this link,  thanks to it I have found this thread (of Come-from-Beyond) : https://bitcointalksearch.org/topic/why-is-bitcoin-safe-against-a-quantum-computer-153302


Don't want to open the link, here the post:

We can assume everything because I didn't still see a valid and functionally quantum computer.

SHA256 will never be cracked during our lifetime and beyond, this is a non issue. Efforts should be put instead in what to do with the blocksize limit.