New Way of thinking ?

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i was reading an article about network security, i found this beautiful words shows you how to think before you start new project or even in your life affairs. i love to see your comments. here is go :- The Four Levels of Proof (from least to most secure) 1 - What You Know - Passwords are widely used at this level 2 - What You Have - Digital certificates, smart cards, or other physical tokens 3 - What You Are - Biometrics such as fingerprints and iris recognition 4 - What You Do - Dynamic biometrics such as hand writing or voice recognition