If you want Doorman to generate a random password you can define the length and select the characters that should be used. You can choose between letters in lower and upper case, numbers and special characters.

To be sure, that your password is good enough, Doorman has a scale, where the safety of your password is shown.
When the scale is red your password can be cracked in under an hour, yellow passwords are save enough for web accounts where the attacker has to wait some seconds after every tried password. Green passwords are save enough for your private data on your harddisk (if your encryption software has no security holes of course).