Topic: Missing 10 Characters in WIF Private Key - Can I recover them? - page 3. (Read 1959 times)

What kind of hardware did he have to solve 10 characters in 11 minutes! Thats awesome and is exactly what I need. going to look into this as well now!
**EDIT** I just saw he did it with just a CPU. Thats crazy! But I don't have public key, so thats not gonna help me much right? And since this address has never sent anything I can't get it right?

I will check it out. I have two 1070s in a rig I can dedicate this too, so hopefully it can do some fast solving. I will message back if I need help. Thank you!

Also I should note I only have the WIF key and public address. I don't have the private address or public key. THe WIF is missing 10 character exactly due to damage of paper wallet. Does this make any difference?

Normal Kangaroo yes, but I have already patched it for solving WIFs, custom stride is supported. Link in post above

1 year ago, user PawGo calculated exactly your case (10 missing WIF characters) but with the public key in less than 11 minutes.


Thread: Using Kangaroo for WIF solving https://bitcointalksearch.org/topic/--5315607

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Edit: PawGo posted

The program I'm using is able to skip-count so I think that can mitigate the speed penalty. So I can jump through each next value, adding the huge difference to the previous each time to get the next.

Unfortunately I haven't been able to add GPU support to FinderOuter yet.

Do you have a faster way I can do this with GPUs? I have used your tool, but with just CPU its going to take far too long for 10 missing characters.

Keep in mind that this method is significantly slower than to simply test each character permutation.
You see each character at the start of the string (from left) converts to a much bigger integer than any character from the end of the string. So even the difference between 1 char missing becomes huge.
Take the following example:
Ky**DfuvLpt8eSb8EQzhZwDCQeCaycKeAoxJMY8pfPZXmn3uB38R
Even though only 2 characters are missing the difference between Ky11Df... and KyzzDf... as integer is
While the permutations are only 3364.

Ok, so I get how to get the range for the start and finish in hex to then use in the --keyspace. What I don't know is how did you get the decimal number that starts with 244 that goes after --stride?

Also do I plug the public address in anywhere?

Thank you,
S.

Pollard's Kangaroo method also uses a start and end range. However, it does not support strides (AFAIK) because Pollard's Kangaroo algo is using it's own kind of stride while making the tame and wild kangaroos hop. There's no way to tell Kangaroo: "OK, there is a part of the private key at the end that's already known, don't search those bits". The consequence is that for this particular situation, Kangaroo will take longer to find the PK (way too long actually).

Bitcrack, on the other hand, lets us specify an arbitrarily large stride and it converts it to a 256-bit int. Since in this case, 80% of the private key is already known, we can make the stride equal to that huge PK chunk at the end and effectively, only search keys between Kw11111111...... and Kwzzzzzzzzzz.......


My hex for w1111111111 came from the following input: w1111111111JzXaqU2rcFSoaLaehAQHqoQX1cWCo92tAA3ihLJ7oQX1cWCo92tAA3ihLJ7 (I accidentally duplicated the last part).

so I am plugging the value into that site: w1111111111JzXaqU2rcFSoaLaehAQHqoQX1cWCo92tAA3ihLJ7 and for hex I am getting:

64 B3 82 BA 7E 44 5B 0F 02 B1 26 EE 95 04 62 B9 E3 A8 8D 67 7C 5D E1 74 E6 44 88 6D 5B 20 F8 8F F0 10 E5 FF A5 C0. I feel like I am doing something wrong on the site.

Any insight? I am not getting the hex values you got in your original post.

I thought, you have the public key too.


Without an outgoing transaction, we don't have the public key, it will take longer.

I wish you good luck.

Yeah you're right - my memory was a bit rusty. In any case just replace the -u flag with -c.

I simply converted the base58 of the lower characters to decimal (and hex). First I went to this page: https://www.dcode.fr/base-58-cipher

And then I pasted the characters after the lost 10 chars inside the page. Before the characters, I pated the 'w' (since you know you have that), followed the 10 characters lowest possible private keys that still base-58 encode into w........JzXaqU2rcFSoaLaehAQHqoQX1cWCo92tAA3ihLJ7 - replace the dots with 10 "1" (the number one) characters. Because 1 is the first digit of base8 number system. The resulting hex gives the starting range.

Then to get the end range, you repeat the process but instead of ten 1 characters, you insert 10 'z' characters (the highest character in base58 is lowercase 'z').

To get the stride, I simply converted the lower part of the base58 you had (the one after the dots).

To determine the start and end ranges and the stride, you only need part of the WIF, not the public address.

These steps will create a range and strie that is suitable to input inside Bitcrack.

No problem, because Bitcrack is more efficient than Kangaroo for your problem (also, Kangaroo will only work if you have the public key, not the address).



58**10 is a very large number, however to estimate the difficulty, you need the equivalent power in base 2, so what we do is we take the log2 of the result: log2(58**10). Then if gives us the difficulty in bits: such that 2**bits == 58**10 (here, bits equals 58.a_fractional_part).

Difficulty can also be written as "10 base 8 characters", but its common for programs to estimate it in terms of bits as well.

This will probably not take minutes unless you have a large GPU farm, but a few weeks is a more accurate estimate. Since Bitcrack can only talk to 1 GPU as far as I know.

You said above that we could do it in minutes. Is that not possible now since we don't have any outgoing TXs?

Thanks,
S.

We don't have an outgoing transaction, so we can't do it with pollard or kangaroo.

Really? I thought with 10 missing characters that was 58^10th or a large number and it was going to take centuries to solve this. How exactly do I solve this in minutes? What tool should I use, or is there something custom? I am willing to pay a bounty for someone assisting me to set this up on machine.

So that would be very easy. ~60 missing bits, we would have the private key within minutes.

Sadly this was an offline wallet, so it only ever had incoming transaction. It has never sent out.

'

I thought WIF keys that began with K or L were compressed keys and WIF keys that began with 5 were the uncompressed ones? Also I am a bit confused how I get those big numbers with only the public address and a WIF key that is missing characters. Could you elaborate anymore? I apologize I am fairly new to learning about all this.

If there is an outgoing transaction, then with the un/compressed public key and kangaroo or pollard, also possible.