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Topic: Quantum Computer. - page 4. (Read 4446 times)

legendary
Activity: 1302
Merit: 1008
Core dev leaves me neg feedback #abuse #political
August 06, 2014, 05:31:12 PM
#16
If quantum computers really going to exist, we will need to update our crypto protocols to stronger ones(SHA-1024)?

But the same crypto technology still can be used, so we will only need some adaptation after the panic wave

If they really can break one-way mathematical functions, just updating to a more complex one doesn't work... It's a question of what exactly will be possible with quantum computers.

sigh...already been discussed to death in other threads.

there is no known or even theorized quantum algo or speedup for breaking one way functions.
only ECDSA.
sr. member
Activity: 378
Merit: 250
FURring bitcoin up since 1762
August 06, 2014, 05:23:01 PM
#15
If quantum computers really going to exist, we will need to update our crypto protocols to stronger ones(SHA-1024)?

But the same crypto technology still can be used, so we will only need some adaptation after the panic wave

If they really can break one-way mathematical functions, just updating to a more complex one doesn't work... It's a question of what exactly will be possible with quantum computers.
legendary
Activity: 1834
Merit: 1009
August 06, 2014, 05:05:41 PM
#14
If quantum computers really going to exist, we will need to update our crypto protocols to stronger ones(SHA-1024)?

But the same crypto technology still can be used, so we will only need some adaptation after the panic wave
sr. member
Activity: 378
Merit: 250
FURring bitcoin up since 1762
August 06, 2014, 04:56:40 PM
#13
ok here goes

SuperMUC the super computer in germany is the equivelent of 110,000 personal computers.

how we all know from the old CPU mining days that CPU mining can only handle 5-7M/hash a second mining bitcoin.
so superMUC would be the equivalent of 550Ghash (half a terrahash)

yes that's right SuperMUC is only a half a terrahash bitcoin miner. now if a quantum computer is 1000 times that would be half a petahash

so with bitcoin hash power at 138/170 petahash's. there would still need to be about 300 quantum computers based on the 1000x the speed of SuperMUC figure given by the OP


You are talking about a quantum computer that is running a Turing complete machine, i.e. is a multi-/all-purpose machine. If you optimize that quantum computer to do one thing (SHA256) things will look dramatically different.
Also: what if you use a quantum computer to reverse one-way mathematical functions? Goodbye, PoW....
legendary
Activity: 4424
Merit: 4794
August 06, 2014, 04:52:57 PM
#12
ok here goes

SuperMUC the super computer in germany is the equivelent of 110,000 personal computers.

how we all know from the old CPU mining days that CPU mining can only handle 5-7M/hash a second mining bitcoin.
so superMUC would be the equivalent of 550Ghash (half a terrahash)

yes that's right SuperMUC is only a half a terrahash bitcoin miner. now if a quantum computer is 1000 times that would be half a petahash

so with bitcoin hash power at 138/170 petahash's. there would still need to be about 300 quantum computers based on the 1000x the speed of SuperMUC figure given by the OP
sr. member
Activity: 378
Merit: 250
FURring bitcoin up since 1762
August 06, 2014, 03:21:19 PM
#11
Guys i wanted to discuss about quantum computers, How will they affect BTC

1st thing is that these computers will be 1000s of times faster than the current super computer so my question is what will happen to the difficulty if it rises like a rocket then the price of BTC will also rise like a rocket?

2nd thing is hacking, When these computers get to the consumer market won't hacking become a problem?

Edit: One more question will this also mean the 21 million bitcoins will be made faster?

For now i have got these points i will edit as the post progresses.

It depends whether one-way mathematical functions can be reversed. If that happens, we have a problem. Also, it isn't a question how fast quantum computers are, but rather if they are able to solve the problems needed in order to 'crack' bitcoin. If they can, we are immediately burned.
legendary
Activity: 1302
Merit: 1008
Core dev leaves me neg feedback #abuse #political
August 06, 2014, 02:33:42 PM
#10
Have you tried searching the forum? There is already a wealth of information available on this topic.

Youtube doesn't open in pakistan, I don't visit any site other than bitcointalk.org for bitcoin infromation and your 3rd link is also a youtube link. So even if i had searched it would have been no use.  Wink

Holliday didn't post any links, the guy above him did.  Anyway, there are literally 100s of topics on bitcointalk.org that don't involve youtube here are a few:

https://bitcointalksearch.org/topic/why-is-bitcoin-safe-against-a-quantum-computer-153302
https://bitcointalksearch.org/topic/quantum-computers-and-bitcoin-133425
https://bitcointalksearch.org/topic/nsa-seeks-to-build-quantum-computer-that-could-crack-most-types-of-encryption-396540



Thanks but can you answer my last question?

No amount of computing power will make the 21,000,000 coins come faster
because difficulty is always adjusted.
full member
Activity: 208
Merit: 100
August 06, 2014, 02:33:37 PM
#9
Even if they breake the first encryption of bitcoin, which I think it has 3, the other 2 will be strong enough for the hacker won't be able to steal your coins, however, if you send your coins to another wallet, the hacker would be able to figure your private key and then your wallet security would be compromised.
So, every time that you send your coins to an address, you'll have to send all of your coins to another one, and keep doing that forever.

That's what I've read in some article around here.
sr. member
Activity: 294
Merit: 250
August 06, 2014, 01:40:29 PM
#8
Youtube doesn't open in pakistan, I don't visit any site other than bitcointalk.org for bitcoin infromation and your 3rd link is also a youtube link. So even if i had searched it would have been no use.  Wink

Can't you use a proxy?
legendary
Activity: 1512
Merit: 1218
Change is in your hands
August 06, 2014, 12:45:54 PM
#7
Have you tried searching the forum? There is already a wealth of information available on this topic.

Youtube doesn't open in pakistan, I don't visit any site other than bitcointalk.org for bitcoin infromation and your 3rd link is also a youtube link. So even if i had searched it would have been no use.  Wink

Holliday didn't post any links, the guy above him did.  Anyway, there are literally 100s of topics on bitcointalk.org that don't involve youtube here are a few:

https://bitcointalksearch.org/topic/why-is-bitcoin-safe-against-a-quantum-computer-153302
https://bitcointalksearch.org/topic/quantum-computers-and-bitcoin-133425
https://bitcointalksearch.org/topic/nsa-seeks-to-build-quantum-computer-that-could-crack-most-types-of-encryption-396540



Thanks but can you answer my last question?
legendary
Activity: 4228
Merit: 1313
August 06, 2014, 12:39:15 PM
#6
Have you tried searching the forum? There is already a wealth of information available on this topic.

Youtube doesn't open in pakistan, I don't visit any site other than bitcointalk.org for bitcoin infromation and your 3rd link is also a youtube link. So even if i had searched it would have been no use.  Wink

Holliday didn't post any links, the guy above him did.  Anyway, there are literally 100s of topics on bitcointalk.org that don't involve youtube here are a few:

https://bitcointalksearch.org/topic/why-is-bitcoin-safe-against-a-quantum-computer-153302
https://bitcointalksearch.org/topic/quantum-computers-and-bitcoin-133425
https://bitcointalksearch.org/topic/nsa-seeks-to-build-quantum-computer-that-could-crack-most-types-of-encryption-396540

legendary
Activity: 2394
Merit: 1216
The revolution will be digital
August 06, 2014, 12:35:43 PM
#5
Guys i wanted to discuss about quantum computers, How will they affect BTC

1st thing is that these computers will be 1000s of times faster than the current super computer so my question is what will happen to the difficulty if it rises like a rocket then the price of BTC will also rise like a rocket?

2nd thing is hacking, When these computers get to the consumer market won't hacking become a problem?

For now i have got these points i will edit as the post progresses.

This is actually a well discussed topic since 2010. Just to note, if Quantum computers break bitcoin, then they'll break your online banking too. So, first worry about that.
legendary
Activity: 1512
Merit: 1218
Change is in your hands
August 06, 2014, 12:34:17 PM
#4
Youtube doesn't open in pakistan, I don't visit any site other than bitcointalk.org for bitcoin infromation and your 3rd link is also a youtube link. So even if i had searched it would have been no use.  Wink
sr. member
Activity: 254
Merit: 1258
August 06, 2014, 12:25:39 PM
#3
So much has already been said on these you won't get any fresh answers, go looking for information.
legendary
Activity: 1512
Merit: 1218
Change is in your hands
August 06, 2014, 12:09:54 PM
#1
Guys i wanted to discuss about quantum computers, How will they affect BTC

1st thing is that these computers will be 1000s of times faster than the current super computer so my question is what will happen to the difficulty if it rises like a rocket then the price of BTC will also rise like a rocket?

2nd thing is hacking, When these computers get to the consumer market won't hacking become a problem?

Edit: One more question will this also mean the 21 million bitcoins will be made faster?

For now i have got these points i will edit as the post progresses.
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