Migrating from Microsoft.AspNetCore.Authentication.AzureAD to Microsoft Identity Web authentication library to integrate with Azure AD.

I recently had a chance to clean up some of the deprecated libraries I used for validating a JWT access token or obtain one via the client-credentials flow or the on-behalf-of flow. The libraries I used were under the Microsoft.AspNetCore.Authentication.AzureAD packages. Per the document, since ASP.NET core 5.0, users should use the Microsoft.Identity.Web package to integrate with Azure AD and Azure ADB2C.

How can you trust a JWT to be authentic?

In this post, I am going to share a few things I have learned about JWT token. Specifically, I am going to go over the structure of a JWT and how you can trust the information in the token to be authentic by validating the signature.

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