• 1) Password must be between 6 and 20 characters     long.
• 2) Password should be combination of letters (a-z, A-Z)     and digits (0-9).
•     Ex:- aAbBcC, aA1bB2cC2, a1b2c3 etc.
• 3) Password must be different from user name.
• 4) Password validation is case sensitive.