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I understand www.lastpass.com uses AES256 algorithm as explained at : https://lastpass.com/support.php?cmd=showfaq&id=1096

AES utilizing 256-bit keys as well as PBKDF2: https://helpdesk.lastpass.com/account-settings/general/password-iterations-pbkdf2/

lastpass provides a bar to indicate password strength. Using 'asdf1111' as a password gives a moderate password strength :

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Same password but uppercase 'ASDF' provides a stronger password (indicated by green bar) : enter image description here

Why is uppercase text password stronger than lowercase ? I assume it's related to the AES256 algorithm implementation ?

blue-sky
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  • This password strength meter is probably an entirely proprietary solution and has nothing to do with PBKDF2's or AES' specifics. Since it's probably proprietary, this cannot be answered. – Artjom B. Sep 04 '16 at 20:11
  • Uppercase letters are much rarer in normal text that lowercase letters, so their usage is probably encouraged more. – Artjom B. Sep 04 '16 at 20:15

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