ActiveAuth

ActiveAuth is a powerful yet easy to use solution which enables two-factor authentication for your wordpress site. 
The plugin can increase your online security and will protect your privacy by adding a second layer of identity verification to prevent access to your site by password hacking. 
The two-step verification (two-factor authentication) sends a second request, after you enter your ID and password on the website to your mobile device. 
Even if you are using are using the strongest password ever, you never can be sure if you are not a subject of password sniffing or hacker attack on the password database. 
By adding the 2nd layer of authentication, you remain secure even in the event your password for the first step is lost or stolen. 
Simple and efficient you can use Mobile Push (over data) SMS, or even a phone call for the 2nd step.

ActiveAuth is a powerful yet easy to use solution which enables two-factor authentication for your wordpress site.

matrixplatform

TeddyID Lite allows your users to log in without entering a password, yet more securely.
Users will have to enter a password only once, TeddyID will suggest encrypting and saving the password. The next time the user tries to log in, the user just clicks his username (see the screenshot), we pick a random picture and send it to user’s two devices: his computer and his phone (with our free app installed). The user makes sure the pictures match and taps “Yes” on his phone. We decrypt the password, fill it in, and submit the form. Login complete.
With TeddyID Lite, your users won’t have to remember, nor type, the password for your site. This is a free service for WordPress based sites.
Nothing is changed in your wordpress database. Passwords are encrypted/decrypted only in browser.

Teddy ID Lite

Enables your users to log in to your site without manually entering the password. Instead, user just taps one button on his phone.

ActiveAuth vs Teddy ID Lite