![]() If a time delay is required, a VerificationWindow object can be provided that describes the acceptable range of values to check. Simply omitting the optional parameter will cause this default behavior. While a OTP is sent to you, a TOTP is generated in a mobile app. Unlike a TOTP which is valid for 30-60 seconds, OTPs are usually valid for around 5-10 minutes. ![]() The default is that no delay will be accepted and the code must match the current code in order to be considered a match. A one-time password (OTP) is randomly generated and sent to your registered number or email for authentication of a transaction or as a means to gain access into an account. The actual step where the match was found will be reported in the aforementioned output parameter. A Kotlin one-time password library to generate 'Google Authenticator', 'Time-based One-time Password' (TOTP) and 'HMAC-based One-time Password' (HOTP) codes based on RFC 42. This parameter allows you to define the window of steps that are considered acceptable. The VerifyTotp method takes an optional VerificationWindow parameter. The exact text in the RFC is "We RECOMMEND that at most one time step is allowed as the network delay." How does the Google Authenticator Work HOTP TOTP Difference 2FA Authentication - YouTube 0:00 / 19:00 How does Authy work Whats HOTP and TOTP Whats multi factor. RFC 6238 Section 5.2 defines the recommended conditions for accepting a TOTP validation code. ![]() This library will only go so far as to determine that there was a valid code provided given the current time and the key, not that it was truly used one time as this library has no persistence. It is up to the consumer of this library to ensure that only one match for a given time step window is actually accepted. The output parameter reports the specific time window where the match occured for persistance comparison in future verification attempts. RFC 6238 Section 5.2 states that a code must only be accepted once. This is provided so that the caller of the function can persist/check that the code has only been validated once. There is an output long called timeWindowUsed. If the overload that doesn't take a timestamp is called, DateTime.UtcNow will be used as the comperand. This blog post (link takes you to an external page) takes a more detailed look at the security concerns of SMS 2FA.Public bool VerifyTotp ( string totp, out long timeWindowUsed, VerificationWindow window = null ) public bool VerifyTotp ( DateTime timestamp, string totp, out long timeWindowUsed, VerificationWindow window = null ) Other channels Twilio Verify supports include push, voice, and email. Most customers end up implementing multiple forms of 2FA, so their users can choose the channel that works best for them. TOTP has stronger proof of possession than SMS, which can be legitimately accessed via multiple devices and may be susceptible to SIM swap attacks. 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. Faster (link takes you to an external page) 'If you set up 2-Step Verification, you can use the Google Authenticator app to receive codes.Software based, not dependent on carrier fees or telephony access and deliverability Standardized (link takes you to an external page).While SMS is an ideal solution for 2FA adoption (link takes you to an external page) and ease of use, TOTP has several benefits including:
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