Combination of small and large (irregular), numbers and other characters (eg $ & <>% _ () [] {} ... - just what the SW allows), but not recommended (sometimes not even possible) diacritics . Example - dangerous - password08 - inappropriate - SrPeN2014 - more appropriate - $ rTuzKa2014 A decent option for people who use passwords only occasionally and therefore do not remember more complicated is to invent a sentence (which they remember) and derive the password from it. Example As the forest is called, it is called from the forest - without spaces and diacritics and punctuation O