![]() ![]() * This method uses the JCE to provide the crypto algorithm. * This is an example implementation of the OATH Terms contained in, the Simplified BSD License set forth in SectionĤ.c of the IETF Trust's Legal Provisions Relating to IETF Documents Modification, is permitted pursuant to, and subject to the license Redistribution and use in source and binary forms, with or without **Ĭopyright (c) 2011 IETF Trust and the persons identified asĪuthors of the code. The RFC also includes test vectors to verify implementations. To set up 2FA on the server, a secret key is generated and transferred to the users. Jumping straight to the code – this is the reference implementation from the RFC. The user then opens an OTP-generating application, such as Google Authenticator, and enters the generated code. Put it together and we can have reasonable confidence that we’ll have matching clocks on the client and server so TOTP becomes a good option. Prompt the user to type the TOTP displayed on their authenticator app and use it to finalize MFA enrollment: // Ask the user for a verification code from the authenticator app. if you’re able to periodically synchronize them to a PC. const secret cretKey After the user adds their secret to their authenticator app, it will start generating TOTPs. Modern cell phones also have the accurate time since they include GPS receivers.įinally dongles with LCD displays can include accurate clocks, esp. I think the major distributions set it up by default but could be mistaken about that. This is a straightforward algorithm that only requires an accurate clock and a shared secret.Īccurate times have been a pain in the past – computers did not include particularly good real time clock chips – but any server should now be using NTP. Your phone got stolen or heavily damaged. How do you do it? Time-based One-Time Passwords (TOTP)Īn increasingly popular approach is Time-based One-Time Passwords (TOTP) ( RFC6238). On Google Auth and any other service using TOTP provides you the time-based tokens, but they understand the possibility of losing the device or not being able to access the codes. Let’s say you want to use two-factor authentication on your site. ![]()
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