Is any method How to crack btc with known publick key and privkey from pubkey?

[COBRAS]

Is any method How to crack bitcoin with known publick key and known privkey from pubkey?

Br

[AdolfinWolf]

Is any method How to crack bitcoin with known publick key and known privkey from pubkey?

Br

Your question doesn't make sense.

If you have a private key, you can derive the public key(s), otherwise - it's next to impossible.

known publick key and known privkey from pubkey

If you're referring to xpub + priv -> xpriv, this is only possible for unhardened derivation.

(Only thing i can think of which makes sense given the variables you're referring to, but you really need to be more specific if you want a concrete answer.)

[TheArchaeologist]

Is any method How to crack bitcoin with known publick key and known privkey from pubkey?

Br

Absolutely not, if that was the case bitcoin would be severely broken.

Bitcoin uses ECDSA (‘Elliptical Curve Digital Signature Algorithm’) so you can generate a random private key (a really big number) and calculate the public key that goes with it. But is is impossible to do the operation the other way around: calculating the private key from a public key.

[HCP]

Is any method How to crack bitcoin with known publick key and known privkey from pubkey?

AdolfinWolf is correct, your question as it currently stands makes very little sense...

If you already have "known privkey", then what exactly are you trying to "crack"?

[pooya87]

every time you create a transaction you reveal your public key, there are even public keys revealed and are on the blockchain that are as old as bitcoin since the very early transactions paid to public key not public key hash like nowadays. you can make your own conclusion!
and you should stop reading topics you don't understand like Pollard's kangaroo topic or any similar ones.

[bigvito19]

I guess he is trying to say get a privkey from the public. These are 2 ways but they both can take some time to find the privkey.

Kangaroo and RHO

[TheArchaeologist]

I guess he is trying to say get a privkey from the public. These are 2 ways but they both can take some time to find the privkey.

Kangaroo and RHO

Actaully there are more than those two, for example "General Number Field Sieve" and "Baby-Step-Giant-Step" are other algorithms aimed at doing this.

However: None of these algorithms can be used to find a truely random generated private key based on a known public key. In theory it is possible if you have infinite computing power and infinite time (or at least a couple of billion years) available. In reality you will look at cost versus reward and you will find the cost of running infinite computing power running for billions of years is not worth the reward of "cracking" a single private key.

So in the end the algorithms you mention are only usable in the case of bitcoin for very specific cases where a private key was not generated randomly but chosen from a much smaller searchspace.