Usage Download the latest release Generate a list of possible passwords on STDOUT Locate the masterkey.cryptomator Feed the passwords to the cracker utility: cat passwords.txt | java -jar cracker-x.y.z-fat.jar path/to/masterkey.cryptomator Tips If you still have access to your vault on some other device (password saved by OS), make good use of it I can't stress this enough: Reduce the set of possible passwords as much as you can! Try to remember the password recipe Bruteforcing scrypt-protected passwords is a hard job for your CPU. Keep it cool to prevent thermal throttling Next time: Use a password manager