This E-Vidya website uses mandatory 2-factor authentication (sometimes referred to as 2FA or TFA) for registered users.
You are free to use any TOTP-compliant 2-factor authenticator program of your choice. We recommend the open-source FreeOTP+ android app for 2FA (FreeOTP+) available from the open-source android app repository F-Droid. For iOS app store link, visit the FreeOTP website. The Google Authenticator app also works.
For android users, the F-Droid open-source app repository offers a variety of open-source android apps that offer all the benefits of using open-source software.