Sometimes you need a password you can keep in mind, but it should as well be absolutely safe, for example for the master password of the data base. The following guidelines give you some hints, how you can create yourself a safe and as well easy to memorize password.
- A safe password should at least be 10 characters long. But it is not really safe until 16 characters.
- A safe password consists of numbers, punctuation marks and special signs. Moreover it contains upper and lower case.
- If you can look up your password in a dictionary, it is not safe enough. Password cracker programs (Brute-Force-Attack) work with such dictionaries and have a crack at their entries systematically.
- The own name, names of relatives, the name of the pet, telephone numbers, car numbers, birthdays and other data that can be found out by a research about you are unusable as a password. The same applies to numbers like pi.
- Avoid keyboard patterns like asdf and jklö.
- Create passwords in which you use the initials from sentence you can easily memorize. "Starting from now I only want to use safe passwords for my PC" makes Sfn1owtuspfmP (additionally here for example I was replaced by 1).
- A further way is to mix up numbers and words: K2e9n1n0w2o0r0t1 out of keyword and 29.10.2001.
- Thereby the date should not be a common birthday.