ASP.NET Core Authentication and Authorization: Choosing and Shipping Securely

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A common failure pattern is an API that authenticates every request yet still lets users read other people's records by changing an ID in the URL. The guide explains that authentication establishes identity while authorization decides what that identity may do, and that the two are often conflated. It introduces ASP.NET Core's pluggable model, covering cookies, JWTs, OAuth 2.0, OpenID Connect and Identity, and the terminology of schemes, policies, claims and principals. It recommends using a managed identity provider rather than building one, and it treats resource-based checks as essential for any endpoint that takes an identifier. A production checklist closes the piece, covering data protection key persistence, token validation, short-lived tokens, login rate limiting and testing of access rules.

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