The Red Hat Enterprise Linux operating system must be configured so that when passwords are changed or new passwords are established, the new password must contain at least one lower-case character.
Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.
Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Check
Note: The value to require a number of lower-case characters to be set is expressed as a negative number in "/etc/security/pwquality.conf".
Check the value for "lcredit" in "/etc/security/pwquality.conf" with the following command: