BozoCrack is a depressingly effective MD5 password hash cracker with almost zero CPU/GPU load. Instead of rainbow tables, dictionaries, or brute force, BozoCrack simply finds the plaintext password. Specifically, it googles the MD5 hash and hopes the plaintext appears somewhere on the first page of results.
It works way better than it ever should.
$ python bozocrack.py -f my_md5_hashes.txt
$ python bozocrack.py -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:
$ python bozocrack.py -f example.txt Loaded 5 unique hashes fcf1eed8596699624167416a1e7e122e:octopus bed128365216c019988915ed3add75fb:passw0rd d0763edaa9d9bd2a9516280e9044d885:monkey dfd8c10c1b9b58c8bf102225ae3be9eb:12081977 ede6b50e7b5826fe48fc1f0fe772c48f:1q2w3e4r5t6y $ python bozocrack.py -s fcf1eed8596699624167416a1e7e122e fcf1eed8596699624167416a1e7e122e:octopus
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.
Do whatever you wish. Public domain, yadda yadda.