The HOTP standard is documented in RFC 4226. With HOTP, both parties increment the counter and use that to compute the one-time password. Both methods use a secret key as one of the inputs, but while TOTP uses the system time for the other input, HOTP uses a counter, which increments with each new validation. HOTP stands for HMAC-based One-Time Password and is the original standard that TOTP was based on. This blog post 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.
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