Password meters overview 
1) Charset and length: Most of the checkers classify a password as invalid or short until a minimum length requirement is met.
2) Strength scales and labels: there would be various strength scales varying from 3 (as in Skype and PayPal which classifies as weak-fair-strong) to 6 (as in twitter which classifies as perfect-okay-could be more secure-not secure enough-obvious-too short)
3) User Information: Certain checkers consider the environment parameters relating to the user such as first name /email address etc.
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Figure 1: Sample Password checker output
By far it is one of best works done relating to the topic. It is a comprehensive study of the most widely used password meters in the current world. The results and the analysis has been a very thrilling experience as it brings forth the fact that we as users cannot blindly depend on these meters and believe that our passwords would remain secure throughout. Several weaknesses and difference of these password meters are brought out to us and could be well used to design a very reliable and uniform password checker.
 Xavier de Carne de Carnavalet, Mohammed Mannan, “From very weak to very Strong: Analyzing password strength meters”
 M.Bishop and D.Klein, “Improving system Security via proactive password checking”
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