Considering login security for user logins, I would like an additional option such as a PIN option for all aspects of user login. This seems quite common now across a number of portals out there such as personal banking, social security/gov. tax sites and I would like possibly to offer this as an option to those who do not want to use Facebook, Twitter etc logins which I use on my projects. I appreciate it could simply be an additional field in the system config, but I would be keen to hear any comments on such features, or possibily a popular D7 module which most people use which for me as a Drupal 'plumber' can just drop in for easy of setup, or a generalistic 'how-to'.
Thanks in advance.