![]() This blog post (link takes you to an external page) takes a more detailed look at the security concerns of SMS 2FA. 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. A web-based analog of the Google Authenticator mobile application. 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. TOTP.APP - is a online generator of one-time passwords, based on TOTP (RFC 6238) algorithm. Using an authenticator app, such as Google Authenticator or Microsoft Authenticator, is a more secure form of MFA than one-time codes sent to you via SMS.
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