Asking users to use " both letters and digits " will often lead to easy-to-guess substitutions such as ' E ' --> ' 3 ' and ' I ' --> ' 1 ', substitutions which are well known to attackers.
Asking users to use " both letters and digits " will often lead to easy-to-guess substitutions such as ' E ' → ' 3 ' and ' I ' → ' 1 ', substitutions which are well known to attackers.
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