Which Authentication Protocols Does Linux Use?

[Udaismith]

I was wondering what authentication protocols Linux uses. Can anyone explain?

[rohan]

Linux supports multiple authentication protocols, including:

• PAM (Pluggable Authentication Modules)

• LDAP (Lightweight Directory Access Protocol)

• Kerberos

• SSH keys

• Radius

• Local password files (/etc/shadow)

These ensure secure user verification.

[chaudarymani03]

Linux supports multiple authentication protocols, including:
PAM (Pluggable Authentication Modules)
LDAP
Kerberos
SSH keys
TACACS+
RADIUS
SAML/OAuth (for web apps)
PAM is the most common for local and remote logins.