In the majority of cases both algorithms are able to figure out what the lowestĮntropy combination of matches on the password are, so I don't see this being too big of an issue. Is no longer an issue with nbvcxz, but will inherently produce different results for some passwords compared to the Obviously "wrong" results for entropy based on the combination of matches because it got stuck in a local minimum. There were quite a few instances I noted that brought about the change to the algorithm used by nbvcxz where there were The algorithm to find the best matches is different between nbvcxz and zxcvbn, that is likely to produce slightlyĭifferent results in cases where zxcvbn is unable to find the best combination of matches due to the algorithm used. Use ConfigurationBuilder setPasswordMatchers(List passwordMatchers) It helps with passphraseĭetection and accurately scoring them, but if we are going for compatibility we need to disable it. This is a new match type which zxcvbn has no equivalent. Use ConfigurationBuilder setDictionaries(List dictionaries)ĭisable separator match types. With nbvcxz you can easilyĬhange which dictionaries are used though, so it's easy to make the different implementations use the same dictionaries. Simply different choices on what lists were important to include by default. There are also additional dictionaries included in nbvcxz that are not in zxcvbn and There are additional leaked passwords in the Make sure both implementations are using the same dictionaries. Use ConfigurationBuilder setDistanceCalc(Boolean distanceCalc) This feature will be sure to cause nbvcxz to produce different results than zxcvbn for a large number of passwords. Passwords which were only slightly different than dictionary words but were not caught with the original implementation. This feature was very helpful in my analysis on helping identify There are some ways to configure nbvcxz forīetter compatibility though, so we will go over those configuration parameters here.ĭisable the Levenshtein Distance (LD) calculation. Which have improved accuracy are the main causes for differences with zxcvbn. Strict compatibility between nbvcxz and zxcvbn has not been a goal of this project. One use case is for generating a "forgot password" temporary pass.Available in the console application as well as the library.Support for generating passwords and passphrases.You can set minimum entropy scores, locale, year patterns, custom leet tables, custom adjacency graphs, custom dictionaries, and custom password matchers.Easy to configure how this library works through the ConfigurationBuilder.Additional PasswordMatchers and Matches can be implemented and configured to run without re-compiling.Default dictionaries have excluded single character words due to many false positives.Exclusion dictionaries can also be built and tailored per-user to prevent obvious issues like using their own email or name as their password.Dictionaries can be customized, and custom dictionaries can be added very easily.LD calculations happen on full passwords only, and have a threshold of 1/4th the length of the password.Dictionary matching has the ability to use Levenshtein Distance (LD) calculations to match passwords which are non-exact matches to a dictionary entry.Support for ranked and un-ranked dictionaries.Better match generation algorithm which will find the absolute lowest entropy combination of the matches.Internationalization support for all text output by the library (for feedback, console output, etc).The project will be built, and the jar file will be placed in the target sub-directory. New methods in password cracking and implement new methods to identify passwords susceptible to Strength estimation is accomplished by runningĪ password through different algorithms looking for matches in any part of the password on: word lists (with fuzzy matching),Ĭommon dates, common years, spacial patterns, repeating characters, repeating sets of characters,Įach of these represent ways an attacker may try to crack a password. Password strength estimation is a bit of an art and science. Nbvcxz is java library (and standalone console program) which is heavily inspired by the work in zxcvbn.
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