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What is authentication?

Authentication is checking that the user is who they claim to be. Phone OTP is one authentication factor.

Quick Answer

Authentication is login/identity confirmation. Phone OTP is a “something you have (the number)” factor. Cascade delivers such codes.

Summary

In products, authentication often includes phone OTP. Cascade delivers the code to the user’s real number via WhatsApp or Telegram.

Key Takeaways

  • OTP is an authentication factor, not the whole security stack.
  • OTP canon: /faq/chto-takoe-otp
  • API key only on the server.

Related Questions

Answer

Authentication is the process of verifying identity (or control of an account) before granting access to an action.

Common factors:

  • password (something you know);
  • phone OTP (something you have — SIM/messenger);
  • device / biometrics (something you are / have).

In SaaS and fintech, OTP often sits on registration, login, password reset, and payment confirmation. It is not a substitute for antifraud and KYC, but a phone-confirmation layer.

Cascade covers delivery of the OTP factor: you call the API, the user gets a code on their number. More about the code itself: “What is OTP?”. About the API token: Bearer, key security. Product scenario: /use-cases/saas.

FAQ

What is authentication?

Authentication is login/identity confirmation. Phone OTP is a “something you have (the number)” factor. Cascade delivers such codes.

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