Im a fool, encrypted wallet.dat , need advice

[Chronic1]

Hi , I recently set up a bitcoin wallet which i encrypted and I cant remember the passphrase........... I know.......

I can narrow down the characters used to about 20, I know where the only upper case letter is, and i know it can contain only 1 of 4 possible symbols at max.
The password is between 8 and 15 characters.

Would this be possible to brute-force this?

I'd appreciate any help

Thanks

[Abdussamad]

Do you have a backup from before you encrypted it? If yes then you maybe able to use pywallet to recover the private keys for some of your addresses. Google for pywallet.

[reich]

Wow.. That sucks how many coins were in it?

[hyoshi]

Hi , I recently set up a bitcoin wallet which i encrypted and I cant remember the passphrase........... I know.......

I can narrow down the characters used to about 20, I know where the only upper case letter is, and i know it can contain only 1 of 4 possible symbols at max.
The password is between 8 and 15 characters.

Would this be possible to brute-force this?

I'd appreciate any help

Thanks

how many BTC do you have in there?

[CIYAM]

Some tools to help brute force passwords from partially known ones have been developed on the forum (you might try searching a bit to see if you can find them).

[reich]

So how do we know your not a hacker tryna steam someones bitcoins?

[Chronic1]

I have 2 btc in there at the moment, my first time ever buying bitcoins , bad start to the whole bitcoin scene

I tried the script posted in this forum already but its not really what im looking for, is there any commercial pieces of software out there?

If I was a hacker I would have to bruteforce the password with no information which apparently is impossible

[reich]

I have 2 btc in there at the moment, my first time ever buying bitcoins , bad start to the whole bitcoin scene

I tried the script posted in this forum already but its not really what im looking for, is there any commercial pieces of software out there?

If I was a hacker I would have to bruteforce the password with no information which apparently is impossible

. Ok i believe you.

[drbanjo]

hu, save the wallet with several copies .. who knows, is possible you type the password tomorrrow or a few days.

[Chronic1]

Ill keep trying that, dont think its going to happen though. No ideas so?

[BitcoinBoss]

Best of luck with this but with a password of that length the odds of a brute force hack are stacked against you.

[timeofmind]

What bitcoin client did you use to encrypt? bitcoind? or did you use a gui client?

[Chronic1]

bitcoind

[timeofmind]

@drbanjo, I second this. Save the wallet for sometime in the future when the password comes back to you... hey maybe you can see a hypnotherapist to have the password recovered from your brain?

[timeofmind]

Did you use bitcoind on a linux console? Perhaps the passphrase is still in your bash history?

[Chronic1]

Windows unfortunately, is there some way to read the keylog ?

I dont think ill remember it, its a password i never used before and I dont think i ever really learned it off, I just presumed it was so easy I wouldnt forget it! haha...................
 

[Yna]

To brute force a password that is 15 characters (assuming it has numbers, lower, and uppercase letters would take forever, literally:

Time Required to Exhaustively Search this Password's Space:
Online Attack Scenario:
(Assuming one thousand guesses per second)   2.48 hundred trillion centuries
Offline Fast Attack Scenario:
(Assuming one hundred billion guesses per second)   2.48 million centuries
Massive Cracking Array Scenario:
(Assuming one hundred trillion guesses per second)   2.48 thousand centuries

[Chronic1]

I'd better get started so

[timeofmind]

I know nothing about windows, but it would be worth searching some windows related forums in order to determine if the pass phrase you typed is stored in a history somewhere; for instance, bash will store everything typed on the command line to an in-memory history that is searchable, and then it will also save that history to disk when you exit the terminal.

[timeofmind]

Also, if you can find a way to remember the length of the pass phrase, and maybe even recall some more of the characters, you may be able to get it down to few enough combinations that it can be brute forced.