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seen Nov 9 '13 at 14:26

Jun
23
comment How does changing your password every 90 days increase security?
A general approach is to just sort the letters of the password and compare them. secret => ceerst terces => ceerst This way you do not even save the original password. You can even check if at least x characters are different. This reduces the possible passwords. You should not save too many old passwords as this reduces the possible new passwords by some extent.
Jun
22
awarded  Editor
Jun
22
revised How does changing your password every 90 days increase security?
Added another argument
Jun
22
comment How does changing your password every 90 days increase security?
Many systems store the last x passwords the user chose to verify against. Furthermore many systems try to prevent reuse by denying passwords with patterns like counting up or reordering the letters.
Jun
22
answered How does changing your password every 90 days increase security?