![]() Increased security compared to SMS 2FA: the secret key input for TOTP is only shared once and the method does not rely on the telephony network, which helps reduce the attack surface.Software based, not dependent on carrier fees or telephony access and deliverability.While SMS is an ideal solution for 2FA adoption and ease of use, TOTP has several benefits including: TOTP's offline support is ideal for users who might need to access their authentication while traveling abroad, on a plane, in a remote area, or otherwise without network connectivity. ![]() Therefore a user can access TOTP via an app like Authy while offline. Neither the inputs nor the calculation require internet connectivity to generate or verify a token. The inputs to the TOTP algorithm are device time and a stored secret key. The algorithm uses a form of symmetric key cryptography: the same key is used by both parties to generate and validate the token. The diagram below shows how the two parties can separately calculate the passcode without internet connectivity. The inputs include a shared secret key and the system time. The TOTP algorithm follows an open standard documented in RFC 6238. System usability scale (SUS) scores show TOTP is most usable The TOTP algorithm This tells us that TOTP is not only a viable method for authentication, but will be preferred by many users. One-time passwords, including TOTP, are a common possession or "something you have" factor and help increase the security of your users accounts.Ī recent study about the usability of 2FA methods found that TOTP had the highest usability score of the various second factors tested. This can be something a user knows, like a password, and something the user has, like a phone. One-time passwords for two factor authenticationĢFA adds an extra layer of account protection by requiring two types of authentication. Get started with our TOTP sample application or step-by-step QuickStart. Twilio's Verify API offers support for TOTP authentication in addition to SMS, voice, email, and push channels. ![]() Authentication apps like Authy and Google Authenticator support the TOTP standard. TOTP is also known as app based authentication, software tokens, or soft tokens. The time-based passwords are available offline and provide user friendly, increased account security when used as a second factor.Įxample TOTP accounts in an authenticator app Unique numeric passwords are generated with a standardized algorithm that uses the current time as an input. TOTP stands for Time-based One-Time Passwords and is a common form of two factor authentication (2FA).
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