Brutforcing a wallet

[blodyx]

It is not hard to find a wallet(the bitcoin address) with enormous amount of money in it.

Its not hard to find a network with enormous amount of hashing power(any pool).

So my question is; How safe is it realy? How long time would it take for a big pool to break a singel address and can it be done?

[iFacts]

You can't just access a wallet if you know it's address. You need to know the private keys, which are private.

[blodyx]

I know to little of cryptography to even start...

Isnt cracking the privatkey about the same work as we already do?

The vanity thing. its just making random addresses and when you find the right public key you also have the private key?

[blodyx]

It is not hard to find a wallet(the bitcoin address) with enormous amount of money in it.

Its not hard to find a network with enormous amount of hashing power(any pool).

So my question is; How safe is it realy? How long time would it take for a big pool to break a singel address and can it be done?

Pretty much impossible. It would take many many lifetimes over. Don't believe me try it! https://en.bitcoin.it/wiki/Vanitygen

Here I tried to brute force this address https://blockchain.info/address/1FfmbHfnpaZjKFvyi1okTjJJusN455paPH better known as DPR's coins.
https://i.imgur.com/D4Buoip.jpg

lol that wallet would be worth "mining"

[Rannasha]

It is not hard to find a wallet(the bitcoin address) with enormous amount of money in it.

Its not hard to find a network with enormous amount of hashing power(any pool).

Bitcoin ASICs can't generate private key / address pairs. They can only mine blocks.

So my question is; How safe is it realy? How long time would it take for a big pool to break a singel address and can it be done?

Like I said, pools with their ASICs can't "break" addresses. And even if they could, it would take far longer than it takes the sun to burn out and die. The address space is simply that large.

[Altoidnerd]

This doesn't even apply to point groups...just hashes.  I know you still can't get the keys.  Just a question about hash functions in general.

So I've tried to stare at hash code and stare and stare and figure out what actually make its irreversible.  Obviously, I lost track of the bits (I was trying to keep it together up here ->    but I didn't follow along..lost it somewhere around xor...).

But... is the irreversibility actually fundamental?  if you could ultra slow motion camera the bits literally flipping due to electrical impulses in the CPU, could you not play the movie backward discovering the inverse of the hash?

Parity and time reversal NeOne!?

[Evil-Knievel]

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[tacotime]

Forget about that vanitygen stuff. Check out Evil-Knievel's Private Key cracker instead ... it operates 1000x faster than vanitygen  

https://bitcointalk.org/index.php?topic=421842.msg4588472

Let's see... 150,000,000 keys per sec on a 7970, or 1.5 * 10^8 k/s.  There are maybe 1.0 * 10^8 Bitcoin addresses with unspent outputs.

If I remember right, the complexity of addresses is 2^128.  So, you have 1/(1.0 * 10^8 / 2^128) = 3.4 * 10^30 keys as the inverse of your probability for finding any private key to some unspent output (or basically, your reduced search space after accounting for all keys with unspent outputs).

That's (3.4 * 10^30 k / [1.5 * 10^8 k/s]) = 2.3 * 10^22 seconds to find a single private key to spend a random address' Bitcoins with a single 7970.  

That's only 52,000 * the age of the entire universe, so you should find one pretty quick!

[Evil-Knievel]

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[tacotime]

That's 100m public addresses with unspent outputs divided by the number of all possible addresses including collisions, or more simply the probability of any address of having an unspent output.

edit: Oh, duh, it's the inverse of that, sorry. X)

[byt411]

Why would you even want to bruteforce a wallet anyway? Are you a nasty thief that has nothing else to steal?

[gadman2]

[Evil-Knievel]

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[gadman2]

Well, the "laws of the universe" know time dilletation right?
You could cause a computer, which is accellerated to near light speed, to bruteforce for 100.000.000.000 years (your picture states that power consumption is negligable)  while here on earth only a few seconds pass by. This is Einstein's "laws of the universe".  

You'd have to do the math but even if 100 billion years pass in a few seconds how many seconds would it take to count to 2^256. Probably a incomprehensible amount of seconds.

[Remember remember the 5th of November]

Well, the "laws of the universe" know time dilletation right?
You could cause a computer, which is accellerated to near light speed, to bruteforce for 100.000.000.000 years (your picture states that power consumption is negligable)  while here on earth only a few seconds pass by. This is Einstein's "laws of the universe".  

You'd have to do the math but even if 100 billion years pass in a few seconds how many seconds would it take to count to 2^256. Probably a incomprehensible amount of seconds.

Well, bruteforcing one address in 100 billion years might be possible, in fact you may even be able to bruteforce a few more than that.

[gadman2]

Well, the "laws of the universe" know time dilletation right?
You could cause a computer, which is accellerated to near light speed, to bruteforce for 100.000.000.000 years (your picture states that power consumption is negligable)  while here on earth only a few seconds pass by. This is Einstein's "laws of the universe". 

You'd have to do the math but even if 100 billion years pass in a few seconds how many seconds would it take to count to 2^256. Probably a incomprehensible amount of seconds.

Well, bruteforcing one address in 100 billion years might be possible, in fact you may even be able to bruteforce a few more than that.

Might want to rethink that...

115792089237316195423570985008687907853269984665640564039457584007913129639936 addresses

and

3155760000000000000ish seconds in 100000000000 years. I'll let you figure up the rest of the math.

[coinits]

I can crack any crypto wallet in seconds, problem is I can not afford a quantum computer.

In all seriousness, can you imagine one of these bad boys hashing?

http://www.dwavesys.com/en/products-services.html

Quantum computing has arrived, thanks to Canadian ingenuity with funding from the CIA and Jeff Bezos.

Maybe we should start a group funding thread for one:)

Also what happens when someone (government or corporation with deep pockets) turns one of these loose on encrypted 'anything'

[gadman2]

I can crack any crypto wallet in seconds, problem is I can not afford a quantum computer.

In all seriousness, can you imagine one of these bad boys hashing?

http://www.dwavesys.com/en/products-services.html

Quantum computing has arrived, thanks to Canadian ingenuity with funding from the CIA and Jeff Bezos.

Maybe we should start a group funding thread for one:)

Also what happens when someone (government or corporation with deep pockets) turns one of these loose on encrypted 'anything'

I don't think you understand the concept of "...they strongly imply that brute-force attacks against 256-bit keys will be infeasable until computers are built from something other than matter and occupy something other than space."

[coinits]

I can crack any crypto wallet in seconds, problem is I can not afford a quantum computer.

In all seriousness, can you imagine one of these bad boys hashing?

http://www.dwavesys.com/en/products-services.html

Quantum computing has arrived, thanks to Canadian ingenuity with funding from the CIA and Jeff Bezos.

Maybe we should start a group funding thread for one:)

Also what happens when someone (government or corporation with deep pockets) turns one of these loose on encrypted 'anything'

I think someone proved that quantum computing doesn't help much in this scenerio.

Maybe, maybe not. But I want one to hash with

[Nephilims]

I imagine in this thread I know the least about the technical aspects of cryptocurrencies and this may be a bit off topic, but when bitcoins reached $1,200 I was curious to know how secure they were, so I gave my kid a task. He had 2 hours to see how many bitcoin addresses he could generate while checking each one for a positive balance. He found 3 accounts that contained many many bitcoins, I was so tempted to take them, that I had to delete his internet history.