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It shouldn't be too hard to find prior art on patent application 20120284783. The primary claim is taking apart the password to identify common words or patterns. The password is checked by various weighted rules and given a final score to determine whether it passes or fails. One example of prior art that I can think of right away is https://tech.dropbox.com/2012/04/zxcvbn-realistic-password-strength-estimation/#comment-493768402. |
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cracklib, which has been on Sourceforge since February 9, 2005 (and which evidently is much older - I can't find an exact date) implements a password validation algorithm that uses a dictionary, patterns, and several other heuristics to reject passwords deemed "not secure enough," based on configured rules. It does not use a scoring system, and merely accepts or rejects a password based on its low entropy or use of common words. Similarly, KDE's KPasswordDialog added a password strength meter on November 1, 2004, and the changelog and mailing list traffic at the time reference earlier work by Mozilla. The meter uses a dictionary and other heuristics to assign a score to an input password. |
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