Password security

Encryption 

Password encryption is ensured by the service called SHA-512 (Secure Hashing Algorithm 512 bits). It includes the protocols:

• TLS
• SSL
• PHP
• SSH
• S/MIME
• IPSec

SHA-512 is invoked with sha512sum. To see the encryption of the word "table":
$ echo -n table | sha512sum

Security enhancement

• Password aging
  It sets the expiration date on a password, enabling its periodic replacement. The command to use is chage.
  
  
• Forcing users to set strong passwords
  This can be done by using PAM - Pluggable Authentication Bodules. It is based on one of thefollowing libraries:

• pam_cracklib.so
• pam_passwdqc.so (provides more options

• Using cracking passwords tools
  This practice secures the password files. Eg. John the Ripper password cracker.