How to implement Secure OTP Login?

OTP (One Time Password or Pin) login is quite popular in most programming languages. However, you need to make it secure by following practices:

  • Limit Login Attempts – Limit login attempts to 3 to 5
  • Block Over Attempts – If more than 10 attempts in the last 24 hours, block user/IP
  • Expire Time – Expire OTP in 2 to 5 minutes
  • OTP RESET – RESET OTP after once validated (success login)

You can change these numbers based on your application requirement.

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