Tag Archives: SMS

Implement Phone verification, 2FA using ASP.NET Core Identity

March 3, 2025 · by · in .NET, .NET Core, ASP.NET Core · 2 Comments

This post shows how to implement phone (SMS) verification and two-factor authentication (2FA) using ASP.NET Core Identity. The solution integrates phone-based verification and 2FA mechanisms. The implementation uses ASP.NET Core Identity’s extensibility to incorporate SMS-based verification during user registration and login processes. SMS is no longer a recommended authentication method due to security risks but […]

The authentication pyramid

March 17, 2021 · by · in Security · 7 Comments

This article looks at the authentication pyramid for signing into different applications. I only compare flows which have user interaction and only compare the 2FA, MFA differences. A lot of incorrect and aggressive marketing from large companies are blurring out the differences so that they can sell their products and so on. When you as […]

Implementing Two-factor authentication with IdentityServer4 and Twilio

July 14, 2017 · by · in .NET Core, MVC, OAuth2, Security, Uncategorized, Web · 14 Comments

This article shows how to implement two factor authentication using Twilio and IdentityServer4 using Identity. On the Microsoft’s Two-factor authentication with SMS documentation, Twilio and ASPSMS are promoted, but any SMS provider can be used. Code: https://github.com/damienbod/AspNetCoreID4External 2017-09-23 Updated to ASP.NET Core 2.0 Setting up Twilio Create an account and login to https://www.twilio.com/ Now create […]