Re: Pubkeys with even y coordinate correspond to privKeys that are less than n/2?

Quote from: COBRAS on September 18, 2022, 11:41:43 PM

I use ecctools for this shit.

./md 8 / 3
Result: 55555555555555555555555555555554e8e4f44ce51835693ff0ca2ef01215c3

./md 2 / 3
Result: 55555555555555555555555555555554e8e4f44ce51835693ff0ca2ef01215c1

then you bruteforce in range from

55555555555555555555555555555554e8e4f44ce51835693ff0ca2ef01215c1

to

55555555555555555555555555555554e8e4f44ce51835693ff0ca2ef01215c3

you need only 2 step to get

55555555555555555555555555555554e8e4f44ce51835693ff0ca2ef01215c3 = then brute you get .... c1, ...c2,... c3

only 2 3 step instaed of 8 then you brute from 1 to 8

this is one of most used ideas of this shit. Shit this is real shit what is too hard or imposible use in real cracking / bruting world.

Are you saying that this is one of the methods of finding out a public key of an address that never revealed its public key, but we know a range of its private keys (Although it is still almost impossible to brute force the private key itself)?

Suppose that there is an address:

Code:

13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so

The range of its private keys is:

Starting key:

Code:

0000000000000000000000000000000000000000000000020000000000000000

let's call it priv1
Which is (36893488147419103232). Which is also exactly equal to 2^65.

Ending key:

Code:

000000000000000000000000000000000000000000000003ffffffffffffffff

lets call it priv2
Which is (73786976294838206463). Which is also exactly equal to 2^66.

Using ecctools we would have to:

Code:

./md 36893488147419103232 / 66

and

Code:

./md 73786976294838206463 / 66

In this case we would get 2 numbers 66 numbers apart from each other.
Meaning that we have 66 numbers (combinations) at our disposal.
In this scenario, What would the numbers represent? What are they? Private keys? Public keys? Something else?
Why would they be valuable for brute forcing a specific public key (or may be a private key)?