How X.509 client certificate authentication works, how to create and configure certificates for development and production, and how to implement validation in ASP.NET Core — no passwords, no tokens.
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How to configure an external Authorization Server — IdentityServer or Keycloak — and correctly integrate it with an ASP.NET Core application. OAuth2 flows, token validation, scopes, and concrete setup steps.
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OAuth2 or OpenID Connect? Learn the real difference between authorization and authentication, how ID Token vs Access Token works, and how to correctly implement OIDC in ASP.NET Core.
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A complete guide on ASP.NET Core Identity — UserManager, SignInManager, custom users, password validators, two-step authentication, lockout, and external providers.
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How to add dynamic permissions in ASP.NET Core? Discover how IClaimsTransformation works, how to enrich claims from the database, and how to implement multi-tenant logic and dynamic permissions.
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How to properly control access in an ASP.NET Core application? Discover the differences between Role-based and Policy-based Authorization, how Authorization Handlers work, and when to use Resource-based Authorization.
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How to correctly implement Refresh Tokens in ASP.NET Core? Discover token rotation, revocation list, the correct basic database schema, and how to detect reuse attacks to secure JWT authentication.
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What exactly is a JWT and how does it work internally in ASP.NET Core? Discover the Header–Payload–Signature structure, the differences between HMAC, RSA, and ECDSA, and critical implementation mistakes.
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