In Enzoic for Active Directory’s password similarity blocking, the systems admin can determine the amount of differences required between the old password and the new password. New passwords are screened by similarity to former password using the Damerau-Levenshtein distance. With this password policy, the minimum number of differences would be 1 and the maximum number of differences for this rule would be 8. Organizations have various opinions on how many characters should be different between old and new passwords, so this allows them to adjust it to the right level for their business.