Bitcoin Forum

Hi ! I lost the password of my bitcoin wallet core, I would like to know if it is possible to recover the password?

Thank you !

Please move this thread to Bitcoin Technical Support (https://bitcointalk.org/index.php?board=4.0), I'm sure people there will help you. And tell us if you still have the .dat file or if you still can remember the length of your password likewise the some letters of it.
Also, would you share if how much coins does this wallet has?

From your post history I see that you also asked if one can hack the wallet.

From what I know all the ways to "recover" the password are brute force attacks.
If you know some details about the password, will make the brute attack less lengthy and with better chances to success.
But I guess it's not the case, and then the chances to recover it are slim.

OP's previous posts:
    
is it possible to hack a bitcoin address? (https://bitcointalk.org/index.php?topic=3095100.0)
Looking private key with balance (https://bitcointalk.org/index.php?topic=5076274.0)

This user went from "I need a hacker", "Can you hack an address?" to using a different MO but still asks for the same thing: access to bitcoin private keys/wallets. Did a quick google search and OP's username (as well as his ICQ acc from this post (https://bitcointalk.org/index.php?topic=5064739.0)) throws some really shady websites in the results, and judging from the post history, I'd say is the same guy: a scammer.

He probably has wallet file with some bitcoins in it, and have been trying to crack it up because he doesn't have access to the private key.

Hopefully, he'll never be able to access the wallet if he's indeed trying to do it.

yes, if the password is less than 10 characters you can, otherwise it will take some time

/KX

This is a very generic answer.. and i feel like this isn't completely true.

If OP has absolutely no clue what the password could be and the charset is relatively big, i don't think a password with 9 chars can be cracked in a short amount of time.

A 9 char password with (1) lowercase, (2) uppercase, (3) numbers and (4) special characters has a char set of 95.
This means there are 95^9 = 630.249.409.724.609.375 combinations.

I don't think this can be brute forced in a reasonable amount of time..


1) 26 chars
2) 26 chars
3) 10 chars
4) 33 chars

I've heard there is  a soft to extract password's hash from wallet.dat and then use Rainbow tables (which are already computed and ready  for everyone on Web)  to find out the relevant combination of characters. This way the necessary time will be greatly reduced.

You consider all possible combinations but there are backdoors, I have recovered 11+ charachters for clients  which you said would not be possible. Lets face it, math is not the only factor here, you have to be lucky sometimes too ;)

I was on a security panel in Malta and our conclution was, yes mathematically brute force is impossible, but there is no such thing as impossible in forensics...

/KX

You probably think of brain wallets (rainbow table) as there is no such thing determinating combination of characters from a hash, its not reversable.

/KX

That's why i said that it is a generic answer which itself is not true.

Under some rare circumstances, yes.. of course it can be recovered.


But just because i recovered a password '123456789012345678901234567890', it doesn't mean that every 30 char passwords can be cracked (which your statement implied).




The hashing algorithms does not have to be reversible for rainbow tables to be applicable.
The concept of rainbow tables is that you trade off computing power for storage space by precalculating the a big amount of combinations for further look-ups in this table.

While this is not applicable to a single wallet file, i still wonder why you have such a misunderstanding regarding rainbow tables. Especially since you claim to be a professional password recovery service  ???

I was talking about reversing hashes. read again.

I do my homework, dont worry.  And I dont need to earn signature points.
/KX

The post you quoted was about rainbow tables. Not about reverting an hashing algorithm.

So.. either you are incapable of reading or you don't understand the concept behind rainbow tables.
Both would be pretty sad, given that you are running a 'professional' recovery service (a.k.a. some GPUs at home?).

Computing rainbow tables has nothing to do with reverting hashes. Period.




That's good. First do everything for school before dedicating yourself to your hobby.

BTW.. what are signature points? And how do i get them?

So could you please make up your mind, you called my service professional then GPU at home.

Dont drink too much redbull, your testerone level seem a bit high.

I dont need to prove myself to a paid signature points harvester, And thanks for the free advertising.

/KX