11 Mar '13, 9am

#Bitcoin Brain Wallet Cracking Contest: the Results

There was no ready fast program for cracking brainwallet passwords. People were running slow Python scripts. With a well-written program in C/C++ and using a GPU, the cracking would take only hours or less. And: because the prizes were small, no superguru programmer/hacker wasted his/her time to write and run this kind of program. No one guessed (except for him ) that the password repeated many times. I tried to mimic a common "stupid" behavior, which people use if there is a minimum character limit for password: repeat the initial password given. Some interesting notices: People reported that they had found some other wallets with small amount of bitcoins accidentally (claims only, no proof, but I can believe it). With a quick-and-dirty Python script you can test 1500 passphrases in one second per core. That means that to crack a four-word passphrase with 10000 words voca...

Full article: http://linja-aho.blogspot.com/2013/03/bitcoin-brain-walle...

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