This security authentication is provided by
many online services, Two-factor authentication is an additional
security service. In this authentication an extra security test include code
from an SMS message, as well as a password. Nowadays it is very difficult for
the user to remember lots of online passwords, and it can involve the variety
among falling victim to cyber criminals and staying safe. This security service
is added on many sites like Twitter, Google, LinkedIn and Dropbox and
more. This security check is accepted by almost online service sites but
Twitter and LinkedIn accepted this security service after a high-profile hacking.
