Implementing Two-Factor Authentication in Scala with Http4s

2023/07/27

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This article discusses the implementation of two-factor authentication (2FA) in Scala using the Http4s library. It is a continuation of a previous article that covered authentication methods. The article begins by explaining the concept of a One Time Password (OTP) and its role in authentication. OTP tokens can be generated using software applications or hardware devices. The article then focuses on HMAC-based One Time Passwords (HOTP), which use a hash function and a moving factor. The implementation of HOTP in Scala is demonstrated using the otp-java library. The article also mentions Time-based One Time Passwords (TOTP) and provides references to relevant standards and resources. Developers interested in implementing 2FA in Scala using Http4s will find this article informative and useful.