Password Comlexity

["Sajjad Haider" <shaider@n2mail.com>]

Hello, 

I am a graduate student, just started working on the area of computer security. Few months ago, when I used Debian OS, I remembered when you create a new account and enter password for it, the kernel warns you if it categorize the password as simple. 
I want to learn about the procedure with which the kernel decides that whether a particular password string is complex or simple.

Thanks in advance
Sajjad


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