The password strength calculation in F-Secure KEY is based on password
Password entropy indicates how easy it is for a password cracking
software to predict a password. The more passwords the software has to try
before guessing the password the higher the entropy is.
To get the maximum entropy score, it is important to include at least
one upper case letter, one lower case letter, one number and one special
character (or symbol) in the password. Also, avoid all character sequences,
such as "12345678" or "abcdefgh", and do not use character repetition (for
example "aaaaaa"). Avoid using common male or female names, common words and
typical passwords. Finally, also the password length has an effect on the
password entropy score.