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PyBozoCrack is a depressingly effective MD5 password hash cracker with almost zero CPU/GPU load.

PyBozoCrack is a depressingly effective MD5 password hash cracker with almost zero CPU/GPU load written in Python. Instead of rainbow tables, dictionaries, or brute force, PyBozoCrack simply finds the plaintext password. Specifically, it googles the MD5 hash and hopes the plaintext appears somewhere on the first page of results.

  • Free software: BSD license

It works way better than it ever should. Go ahead and try.


Basic usage:

$ pybozocrack -f my_md5_hashes.txt


$ pybozocrack -s fcf1eed8596699624167416a1e7e122e

The input file has no specified format. BozoCrack automatically picks up strings that look like MD5 hashes. A single line shouldn’t contain more than one hash.

Example with output:

$ pybozocrack -f example.txt

Loaded 5 unique hashes






$ pybozocrack -s fcf1eed8596699624167416a1e7e122e



To show just how bad an idea it is to use plain MD5 as a password hashing mechanism. Honestly, if the passwords can be cracked with this software, there are no excuses.


BozoCrack was originally written by Juuso Salonen (

PyBozoCrack was rewritten in Python by Henrique Pereira (

History (2014-05-21)

  • Docs now should show 100% on PyPi.
  • Skipped the broken test on PyPy. (2014-05-08)

  • Fixed typo. (2014-05-08)

  • Fixed typo.

1.2.2 (2014-05-08)

  • Cracked hashes are now stored
  • Error message if no cracked hashes are found

1.2.1 (2014-05-07)

  • Bugfix

1.2.0 (2014-05-05)

  • Stand-alone file. Works on windows.

1.0.2 (2014-05-02)

  • Increased test coverage

1.0.1 (2014-05-01)

  • Trying to fix problems with Travis

1.0 (2014-05-01)

  • First release on PyPI.
File Type Py Version Uploaded on Size
pybozocrack- (md5) Source 2014-05-21 13KB