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Editorial Team
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Asked: 2026-05-21T15:19:47+00:00

I’m trying to design a two factor authentication system (on PHP) using SMS as

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I’m trying to design a two factor authentication system (on PHP) using SMS as the second auth method. This is for a test project thus can anyone help me to design this service?

This will be an web based system and below is what i have done so far.

  1. Once the client enters the Username and Password the website will send a secure HTTP request to our server with the MSISDN, a UID (to identify the session), their UserID & PassWord.

  2. Our server will add the request to a MySQL DB and respond the website with a Code, UID and some other info.

  3. Our server will send the client a SMS with the one time password.

  4. Once the client enters the OTP into the website, the website will send another HTTPS request with the encrypted OTP to our server and we will send a success or fail code as the response.

this is the flow i have thought about. Anyone have a better flow? or suggestions?

Thanks.

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1 Answer

  1. Editorial Team

    Seems like a valid mechanism. But what if the SMS device is not in a service area? Or dead battery?

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