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I've lost the password to one of my wallets (it's a small one, don't worry). I was sure I remembered the password ... but evidently I don't.

Is there a program that I can use to brute-force my password, given hints?

Meaning, suppose that I remember that my password was "abc", but in fact maybe it's "Abc" or "Abc0". I would give the cracker program the string "abc" as a hint, and it would try a lot of permutations on it until it finds the real password.

Does such a cracker program currently exist? (Reliable sources please, hopefully open source)

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    @MeniRosenfeld and what does this have to do with this question?
    – o0'.
    Mar 29, 2012 at 12:19
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    @Lohoris: That it proposes alternative solutions to its premise. I am under the impression that this is acceptable use for comments.
    – Meni Rosenfeld
    Mar 29, 2012 at 12:57
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    I had to google "spaced repetition". Found en.wikipedia.org/wiki/Spaced_repetition and thought a link here might be useful.
    – Chris Moore
    Mar 29, 2012 at 16:24
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    @Meni: At this point, the password does not exist anywhere outside his brain (and possibly no longer inside, either) :-)
    – Thilo
    Mar 30, 2012 at 4:27
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    FYI - luckily enough, the password was indeed stored on my Keepass. I just named the entry "wallet" and not "bitcoin", so when I searched for it it didn't come up. But the question is still relevant.
    – ripper234
    Apr 2, 2012 at 16:52

3 Answers 3

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Revalin made available a sript that you can try running:

There may not yet be anything else, but you'ld probably find someone willing to write one if you offered to send your wallet along with what you think the pass phrase might be and ask only for a fraction of the wallet's bitcoins back once cracked.

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    Make sure that the "someone" is trustworthy - at least if you want to get your coins back.
    – BinaryMage
    Mar 29, 2012 at 23:28
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    Depending on how wallet encryption works, you don't need to actually send the wallet itself, but only the header.
    – CodesInChaos
    Mar 30, 2012 at 10:11
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    Much better to ask that person to write a script for him, in exchange for a fixed amount.
    – o0'.
    Apr 4, 2012 at 12:00
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Another alternative is btcrecover, available on GitHub here. From the Tutorial:

btcrecover is a free and open source multithreaded wallet password recovery tool with support for Armory, Bitcoin Core (a.k.a. Bitcoin-Qt), MultiBit (Classic and HD), Electrum (1.x and 2.x), mSIGNA (CoinVault), Hive for OS X, Blockchain.info (v1 and v2 wallet formats, both main and second passwords), Bither, and Bitcoin & KNC Wallets for Android. It is designed for the case where you already know most of your password, but need assistance in trying different possible combinations.

It also supports seed recovery for deterministic wallets:

seedrecover.py is a Bitcoin seed recovery tool which can take a seed with one or more mistakes in it, and recover the correct seed if not too many mistakes have been made.

Full disclosure: I am the developer of btcrecover.

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You should try walletrecoveryservices.com since that appears to do just what you want. (brute forces bitcoin wallet recovery if you forget your password, without being able to steal your bitcoins)

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    – Devyn Collier Johnson
    Jul 16, 2013 at 10:57
  • You might want to add some links to testimonials to this answer. I have heard good things about this service but it's a good idea to be sure about it before handing over your wallet.
    – D.H.
    Jan 4, 2014 at 20:33

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