User Access & Authentication

This module provides a list of email domains that could potentially be Accepted or not during registration and optionally on user profile update.

If it is applied to existing user, you can also customize a reminder to the user upon login.

It can be used in other form creating a custom validation with function:

email_domain_restriction_validate_email(array $emails)
It will return a boolean. True if it's a valid email, false if it's not.

Scan-to-Login™ boosts up your site’s security while adding an innovative fun-factor for registration and login. Our technology has been built to enable an extra layer of security on your website, creating a very secure yet convenient user experience. It provides an easy and fun way to register and login simply by scanning a QR Code with a mobile phone

Scan-to-Login is a Drupal module brought to you by Zapperâ„¢.

Benefits

Increased Security:

Inspiration from the Word Press Minecraft Validator plugin, this module does a simple validation of a user's username when registering for the site to see if they are indeed a minecraft user.

Future planned features

Allow you to add a profile field to a user and validate that username.
Add rules integration so that when a user successfully links a minecraft account, you can perform actions.

This module extends the module Taxonomy Term Permissions by providing four rules actions.

Module to add the necessary javascript and authentication components to allow your site to act as a Mozilla Persona IDP (Identity Provider).

NB: Modules exist already to allow users to log into your site with Mozilla Persona. This module (in conjunction with a couple of other components) allows your site to *provide* Mozilla Persona identities, in the same fashion as http://login.persona.org.

PixelPin integration for Drupal site.

About PixelPin

PixelPin is a B2B2C solution which replaces passwords with pictures. Users choose a picture and click on it in 4 places in sequence to sign in. PixelPin is more secure than a password; it brings banking level security to your business, protecting you and your users better than a password system ever could.

in the name of god

user can buy credit to all activity in your site
publish node
and...

Havan SSO Can be used to log a user in to all sites when those sites exist on different top level domains with using same database

Beef up the security of your site with Authy Two Factor.

You will need to sign up for an account with Authy in order to use this module but there is a FREE tier (https://www.authy.com/product/pricing/) that will work for most small sites.

Users can choose to require Authy on their own account, or the Admin can require all users, or just users of a given role to use two factor authentication.

Login as Other adds another User login block (titled "User login (as other user)") which can be placed in a region on your site. This block shows the same user login form as the normal User login block, but is only shown to authenticated users.