token2

The Token2 Hardware Tokens plugin for WordPress gives you two-factor authentication using the Token2 Hardware Tokens .
The two-factor authentication requirement can be enabled on a per-user basis by administrators.

Token2 Hardware Tokens

Token2 Hardware Tokens for your WordPress blog.

Aurovrata Venet

Use this CF7 extension to enable OTP links to be inserted into confirmation/notification emails sent to email addresses submitted through your CF7 forms. The OTP is a unique link the email inbox user needs to click to confirm their address. The link is valid by default for 72 hours and can be customised.

OTP by Email for Contact Form 7

A small Contact Form 7 extension plugin to enable email confirmation by unique links sent to the email inbox.

Token2 Hardware Tokens vs OTP by Email for Contact Form 7