[[MFA]] > [[OTP]] - [[TOTP]]: Time-based One Time Password - [[HOTP]]: HMAC-based One-Time Password *. [#m3d8adf4] - 2要素認証のTOTPとHOTP、どちらがより安全か? -- https://blog.ohgaki.net/2fa-totp-hotp-which-is-safer