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@@ -1,4 +1,31 @@ -zxcvbn-c -======== +This is a C implementation of the zxcvbn password strength estimation. -C/C++ version of the zxcvbn password strength estimator + +The original coffee-script version is available at + https://github.com/lowe/zxcvbn + +An article on the reasons for this code is at +https://tech.dropox.com/2012/04/zxcvbn-realistic-password-strength-estimation + + +###Dictionary sources + +10000 Most popular Passwords is from +https://xato.net/passwords/more-top-worst-passwords by Mark Burnett (this is a later version than the one used by the original coffee script version). + +The list of names and their populatity is from the US year 2000 census data, as used in the original coffee script version. + +40k words are from movies and TV shows, obtained from +http://en.wiktionary.org/wiki/Wiktionary:Frequency_lists + + +Dictionary trie encoding (used for by the word lookup code) based on idea from the Caroline Word Graph from +http://www.pathcom.com/~vadco/cwg.html + + +### Differences from the original version. + +The entropy calculated will sometimes differ from the original because of + +* A later version of the password dictionary is used +*
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