Topic: Quantum computer? (Read 13009 times)

Sorry to disabuse you, but the DWAVE technology is not a general purpose quantum computer and can not be used to "break" public key cryptography.  And even if it could be, there wouldn't be any 100M speedup, because that number is from a rigged "benchmark".

Actually the usefulness of all these odd features of quantum computing. Well, thanks to those quantum mechanical quirks, a quantum computer could crunch complicated calculations much quicker than the fastest computers today. Because the qubit exists in a superposition of one and zero, rather than one or the other, it can use ones, zeroes, and the superposition of both. By being able to encode multiple possibilities in its fundamental units and It can tackle the problem more efficient than Normal computer.

Actually, it was able to figure out the inverse operation. (15 is produced by which multiplication? Ah, it is 3*5.) 

https://en.bitcoin.it/wiki/Myths#Quantum_computers_would_break_Bitcoin.27s_security

i think your Quantum Computer should neaeds 51% of the btcnetwork which is quit impossible..
Simply the google Somputers arent fast enough for thoose tasks.

Anyways why you want to sabotage it. Thats not so good idea i think

regards
BTC LOVER

Well I wouldn't necessarily say we'll be fine for the next 20 years, but I can be fairly sure we won't have any issues with Quantum computers for at least another decade.

It's kind of a shame the 500 qbit was a dud, I was hoping that they would be able to usher in a new era of computing soon. But at the same time it does have its own issues, so maybe it is better that it hasn't worked yet.

Biggest quantum computer yet was able to figure out that 3 and 5 multiplied gave 15.

I think we will be ok the next 20 years or more


(The 500 qbit computer was a dud, the scientist who discovered the principle behind it, said it did not apply to their solution aka. a big paper weight and no results)

This is naive as hell. All you'd need is a single quantum computer to cripple all cryptocurrencies overnight. IOTA (www.iotatoken) is currently the only crypto to take this seriously

Quantum computers can do certain things many, many times faster, but things like hashing wil stay bout the same. Don't worry, unless quantum computers become ridiculously cheap, we all have nothing to worry about. Even then, the community will push out a new type of cryptography that's quantum proof. You have nothing to worry about.

Quantum computers are close to being invented, but not that colose.

IOTA avoids this by design: http://188.138.57.93/tangle.pdf

Quantum computers can be very dangerous for many things like banks which can be affected the first, because these computers have large power and can decrypt any encrypted key or crypto algorithm.

Great example for the diff between classical computers and quantum computers.  i think if anyone ever gets a working quantum computer going that could possiblly be capable of this it would probably be a reputable organization who we would hope could be trusted to not screw things up, at least until we get some Quantum Nodes up and running......   even some Quantum mining rigs..... lol  thats gona be one hell of a difficulty that day. 

I am assuming that what you are referring to would be considered hacking.  From what i understand, there is no way to hack the block-chain that records all of the BTC transactions that make it what it is.  So in order to successfully steal like that, you would need to be able to change all the code to match in place, which is next to impossible with more code being added each second.

Bitcoin doesn't use encryption. Quantum doesn't doom all kinds of algorithms, our main concern (pending new research) is Shors algorithm.

Have you head of the Google Dwave computer? It's supposedly 100 million times faster than the average PC.

A quantum computer should be able to calculate some algorithms much faster than others, but things like hashing would stay about the same speed. If there is a need, miners could push out a new type of encryption to prevent quantum computers from dominating the hashrate.

Quantum computers will pose a threat to ECSDA. Whilst 256-bit ECC is comparable in strength to 4096-bit RSA, to a quantum computer, all it's concerned with is the length of the numbers. A 256-bit integer is far easier to solve for compared to 3072-bit.. A single signature would be enough to compromise a private key, with a strong enough quantum computer. They pose less of an issue to hash functions, so funds received on a bitcoin address are safer (until the first transaction redeeming them reveals it's public key and signature)

While quantum computers of this size aren't practical right now, they soon will be. I read a journal article documenting a quantum computer for factorizing integers using chemical computers. Nuclear magnetic resonance was used to induce quantum states in a molecule containing 5 fluorine atoms (used to store qubits of information). It's a pretty extreme approach (they won't break ECDSA using this setup), but it was also largely successful. (https://cryptome.org/shor-nature.pdf)

We're mainly waiting on something that helps us realize quantum computing to a practical extent, but upgrading bitcoin to use a new signature algorithm can be accomplished by either a soft or hard-fork if preferred. With all systems, they will be upgraded whenever the risk becomes real.

wrt upgrading, we can only make it opt-in, so softfork is probably best. Anyone who has funds protected by ECDSA would move their coins one, to a new scriptPubKey protected by: OP_PQCHECKSIG (post-quantum checksig, whatever we decide to adopt). We would generate a new address type, starting some other prefix besides 1...., or 3....., and then life would carry on!

This is not sci-fi anymore. Nasa and Google revealed their first Quantum computer that is 100,000,000 times faster than traditional ones. http://www.pcworld.com/article/3013214/hardware/nasa-google-reveal-quantum-computing-leap.html

http://pqcrypto.org/    <- This

Quantum computers do speed up brute force attacks, but that can be countered by doubling the size of the search space (in bits) if it poses a problem.

any scalable[like SHA family] hash/cipher don't need quantum computing horsepower efficency, just  amount of usual one.
quantum computing is interesting applications are something breaking "otherwise unbreakable" cryptosystems.