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Character classes

Character classes: For the purposes of authentication and password complexity, there are four possible character classes: 

  • Upper case alphabetic (e.g. A-Z)
  • Lower case alphabetic (e.g. a-z)
  • Numeric (e.g. 0-9)
  • Special characters (e.g.!@#$%~).

A password with all four character classes might be:  "Always b3 Secure.

  1. it has upper case alphabetic: "A" and "S"
  2. it has lower case alphabetic: "always b ecure"
  3. it has a number: "3"
  4. it has a special character: "." (period)

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