Custom Bitcoin address ? | Bitcointalksearch.org

Light

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Quote from: bountygiver on April 05, 2014, 08:55:30 PM

There is enough energy in the universe to power that.

The correction should be "There is not enough human accessible energy to crack them at the current level of technology (and for the next few decades or even centuries)"

Actually, no. I'm going to give you this overly used infographic.

The problem comes from possible incorrect implementation of the various cryptographic primatives, or quantum computers breaking the algorithm itself rather than a bruteforce attack on every single known key. The chance of a collision is so low I'd say you'd be more likely to be able to win the lottery 5 times in a row than this occurring.

bountygiver

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Quote from: grifferz on April 05, 2014, 02:32:39 PM

Quote from: unick on April 05, 2014, 02:29:22 PM

by hack, I meant how likely is someone to find the correct private key given the public key with that generator

If you mean, how likely is it that someone could generate a private key that matches an already existing and in-use bitcoin address that has funds in it, then the answer is:

Astronomically small, so small that there probably isn't enough energy in the known universe to power the hardware needed to do it.

There is enough energy in the universe to power that.

The correction should be "There is not enough human accessible energy to crack them at the current level of technology (and for the next few decades or even centuries)"

Light

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Activity: 742

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Circa 2010

Now would be a good time for someone to post that infographic about how the laws of physics mean that it's really impossible to brute force private keys.

Anyways, I wouldn't bother wasting your time trying to find and exact match - realistically your more likely to win the lottery 5 times in a row. If your going to mine for an address just for yourself use either oclvanitygen or vanitygen depending in whether you wish to use your GPU or CpU. Do note that your GPU in most cases is faster.

Finally, even if a site uses split key generation I still wouldn't use them, it's still far safer to generate the private key on an air gapped PC.

TookDk

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2^160 is such an unbelievable large number.

There are more oxygen molecules on the earth than 2^160.

It would be the same, as someone tags one single oxygen molecules, at a random time and place - and then after search through all the oxygen molecules on the earth until you find the one that is tagged.

sssubito

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Quote from: unick on April 05, 2014, 03:33:21 PM

I will try for sure... out of curiosity.

Don't waste your time...

My GPU crunches about 15.3 MKeys/s with oclvanitygen, everything longer than 1BoatSLRHtKNngkdXEeobR76b53 was rejected as too long (I had to cut away the last seven chars) and 1BoatSLRHtKNngkdXEeobR76b53 alone is about to take ~4.021*10^30 years for 50% probability to find a match. And that's not even guaranteed ... Grin

The probability to find the private key for a given Bitcoin address is mathematically not zero, but as said before, there is not enough energy and maybe time in the universe to succeed such an attempt.

TookDk

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Quote from: unick on April 05, 2014, 03:33:21 PM

I will try for sure... out of curiosity.

Like I said, it made me wonder but it makes sense, there is a LOT of possible keys that start with 1Boat and has 34 characters !

Greater probability of all the oxygen molecules in the room your are sitting will go to the ceiling at the same time and you will suffocate as a result, then you finding that exact key.

unick

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I will try for sure... out of curiosity.

Like I said, it made me wonder Wink

but it makes sense, there is a LOT of possible keys that start with 1Boat and has 34 characters ! It all comes down to entropy

grifferz

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Quote from: unick on April 05, 2014, 02:37:19 PM

Quote from: grifferz on April 05, 2014, 02:32:39 PM

Astronomically small, so small that there probably isn't enough energy in the known universe to power the hardware needed to do it.

lol.

it's just that here https://en.bitcoin.it/wiki/Vanitygen

they is it took 10 seconds to generate this key pair...

To generate one specific key pair out of the countless billions that also start with "1Boat".

Quote from: unick on April 05, 2014, 02:37:19 PM

so if I try to generate an address with that smame prefix, woulnd't i get the same private key?

You'd get a different one that also starts with "1Boat".

If you don't believe me, please do tell it that you want to generate the key pair that starts with "1BoatSLRHtKNngkdXEeobR76b53LETtpyT" i.e. the whole exact key with the same case, and tell us how long it thinks it will need in order to do this.

Bitcoin Magazine

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Quote from: grifferz on April 05, 2014, 02:32:39 PM

Quote from: unick on April 05, 2014, 02:29:22 PM

by hack, I meant how likely is someone to find the correct private key given the public key with that generator

If you mean, how likely is it that someone could generate a private key that matches an already existing and in-use bitcoin address that has funds in it, then the answer is:

Astronomically small, so small that there probably isn't enough energy in the known universe to power the hardware needed to do it.

what if you are just powering 1 desktop computer that exists in parallel realities
where each reality is working on a different [quantum] exponent

TookDk

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Quote from: Bitcoin Magazine on April 05, 2014, 02:28:15 PM

Quote from: TookDk on April 05, 2014, 02:22:24 PM

Quote from: unick on April 05, 2014, 02:06:30 PM

what's the chances someone could hack those custom addresses (or any other addreses for that matter)

No absolutely not (if you have generated the private key on a offline computer with your own program, and used a good random algorithm)

(brainwallets are "easy" to hack, but that is a completely different story).

As long as your search random (at least as random as your computer allows you) for your public key, then is the chance very small for someone to find the same private key.

When that is said: I am personally very paranoid about my long-term storage private keys, they are all created with physical die's, to avoid the pseudo randomness that all computers have.

so all i'd have to do is hack your place and time (i.e. take a picture of you rolling the dice, then do a SHA-224 sum of the file) and plug that in the brainwallet

Yes, absolutely.

unick

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Quote from: grifferz on April 05, 2014, 02:32:39 PM

Quote from: unick on April 05, 2014, 02:29:22 PM

by hack, I meant how likely is someone to find the correct private key given the public key with that generator

If you mean, how likely is it that someone could generate a private key that matches an already existing and in-use bitcoin address that has funds in it, then the answer is:

Astronomically small, so small that there probably isn't enough energy in the known universe to power the hardware needed to do it.

lol.

it's just that here https://en.bitcoin.it/wiki/Vanitygen

they is it took 10 seconds to generate this key pair...
so if I try to generate an address with that smame prefix, woulnd't i get the same private key?

Code:

$ ./vanitygen 1Boat
Difficulty: 4476342
Pattern: 1Boat                                                                 
Address: 1BoatSLRHtKNngkdXEeobR76b53LETtpyT
Privkey: 5J4XJRyLVgzbXEgh8VNi4qovLzxRftzMd8a18KkdXv4EqAwX3tS

given I have not read thoroughly, and I assume that I can set a higher difficulty to make it harder to find but it made me wonder.

grifferz

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Quote from: unick on April 05, 2014, 02:29:22 PM

by hack, I meant how likely is someone to find the correct private key given the public key with that generator

If you mean, how likely is it that someone could generate a private key that matches an already existing and in-use bitcoin address that has funds in it, then the answer is:

Astronomically small, so small that there probably isn't enough energy in the known universe to power the hardware needed to do it.

skooter

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Quote from: unick on April 05, 2014, 02:29:22 PM

Quote from: grifferz on April 05, 2014, 02:15:47 PM

Quote from: unick on April 05, 2014, 02:06:30 PM

what's the chances someone could hack those custom addresses (or any other addreses for that matter)

Hack how? Ask a more specific question.

by hack, I meant how likely is someone to find the correct private key given the public key with that generator

Zero

unick

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Quote from: grifferz on April 05, 2014, 02:15:47 PM

Quote from: unick on April 05, 2014, 02:06:30 PM

what's the chances someone could hack those custom addresses (or any other addreses for that matter)

Hack how? Ask a more specific question.

by hack, I meant how likely is someone to find the correct private key given the public key with that generator

Bitcoin Magazine

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Activity: 252

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Quote from: TookDk on April 05, 2014, 02:22:24 PM

Quote from: unick on April 05, 2014, 02:06:30 PM

what's the chances someone could hack those custom addresses (or any other addreses for that matter)

No absolutely not (if you have generated the private key on a offline computer with your own program, and used a good random algorithm)

(brainwallets are "easy" to hack, but that is a completely different story).

As long as your search random (at least as random as your computer allows you) for your public key, then is the chance very small for someone to find the same private key.

When that is said: I am personally very paranoid about my long-term storage private keys, they are all created with physical die's, to avoid the pseudo randomness that all computers have.

so all i'd have to do is hack your place and time (i.e. take a picture of you rolling the dice, then do a SHA-224 sum of the file) and plug that in the brainwallet

TookDk

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Activity: 1960

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One coin to rule them all

Quote from: unick on April 05, 2014, 02:06:30 PM

what's the chances someone could hack those custom addresses (or any other addreses for that matter)

No absolutely not (if you have generated the private key on a offline computer with your own program, and used a good random algorithm)

(brainwallets are "easy" to hack, but that is a completely different story).

As long as your search random (at least as random as your computer allows you) for your public key, then is the chance very small for someone to find the same private key.

When that is said: I am personally very paranoid about my long-term storage private keys, they are all created with physical die's, to avoid the pseudo randomness that all computers have.

zolace

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Websites such as BitcoinVanity will let you generate a custom prefix right in your browser. While this is incredibly convenient, you have to trust websites like these to not save your private keys. Furthermore, online vanity address generators may charge a fee, depending on the length of the prefix. If you feel that you can trust such an online service and have no issue paying for a custom Bitcoin address, then go ahead. But if you’d rather put in a bit of extra effort to get a FREE and SECURE address

TookDk

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One coin to rule them all

Quote from: unick on April 05, 2014, 02:02:13 PM

lol, nice

but the question is still how?

you let your gpu run on a script for 15 minute and you found that one ?

This python script works great to generate a pair of puplic/private adr:
https://bitcointalksearch.org/topic/m.3866429

It should not be too hard to modify the script to run in a loop and search for a puplic key containing e.g. "unick".
By allowing both upper and lower case, you greatly reduce the time to find the private key.

grifferz

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Quote from: unick on April 05, 2014, 02:06:30 PM

what's the chances someone could hack those custom addresses (or any other addreses for that matter)

Hack how? Ask a more specific question.

unick

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Activity: 504

Merit: 254

what's the chances someone could hack those custom addresses (or any other addreses for that matter)

Topic: Custom Bitcoin address ? (Read 1485 times)