voluntary, intentional, deliberate, willing mean done or brought about of one's own will. voluntary implies freedom and spontaneity of choice or action without external compulsion. a voluntary confession; intentional stresses an awareness of an end to be achieved. the intentional concealment of vital information deliberate implies full consciousness of the nature of one's act and its consequences. deliberate acts of sabotage
PAM is a framework that assists applications in performing what I'll call authentication-related activities. The core pieces of PAM are a library (libpam) and a collection of PAM modules, which are dynamically linked libraries (.so) files in the folder /lib/security.
What is two-factor authentication? Two-Factor Authentication. Two-factor authentication (2 factor authentication or 2FA) is the authentication process where two of the three possible factors of authentication are combined. The possible factors of authentication are: something the user knows (e.g. a password, PIN code, or answer to secret question)