The OTP, One-Time Password, module provides an additional layer of security to the login process by requiring users to enter a randomly generated one-time password in addition to their regular Drupal password.
The one-time password is generated from within your Drupal system and can be sent via email or SMS. No physical token generator/dongle is required.
Not all users require OTP access on a Drupal system. So, OTP provides the option to enable OTP authentication based on user roles.
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