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Password Strength The omic illustrates the relative strength of passwords assuming basic knowledge of the system used to generate them. A set of boxes is used to indicate how many bits of entropy a section of the password provides. Uncommon non-gibberish base word Highlighting the base word - 16 bits of entropy. . Common Substitutions Highlighting the letters 'a' substituted by '4' and both 'o's the first of which is substituted by '0' - 3 bits of entropy. .wcd.me/ru4gJ9 xkcd.org/936 Password13.1 Entropy (information theory)7.8 Bit7.4 Entropy4.5 Xkcd3.4 Gibberish2.4 02.2 Root (linguistics)2.1 Knowledge1.7 16-bit1.6 Comics1.4 Password strength1.1 Inline linking1 Word (computer architecture)1 Word1 URL0.9 Computer0.9 1-bit architecture0.8 Password (video gaming)0.8 Annotation0.7