Certificate Validation and CRL Checking in .NET

When building secure network applications, simply checking if an SSL/TLS certificate is expired is not enough. You must also ensure that the certificate has not been compromised and revoked by the issuing authority. This text-only course guides you through the fundamentals of digital certificates, public key infrastructure (PKI), and how to implement robust Certificate Revocation List (CRL) checks in your .NET applications. You will learn to write secure validation logic that protects your desktop and backend clients from connection vulnerabilities. What you'll learn: - Understand the core concepts of PKI, certificate chains, and why revocation checking is critical for modern security. - Implement custom certificate validation in .NET using modern HttpClient configurations and validation callbacks. - Configure automatic and manual Certificate Revocation List (CRL) checks for HTTPS connections. - Compare CRLs with Online Certificate Status Protocol (OCSP) to choose the right verification strategy. - Handle validation edge cases, network timeouts, offline scenarios, and certificate chain errors. - Apply modern .NET security best practices, including secure TLS protocol selection and cipher suite configuration. This course begins with foundational security terminology and certificate structures before moving into practical C# implementation patterns. Through clear, step-by-step written explanations and code snippets, you will gain a deep understanding of network security mechanics. This program is designed for developers new to application security and .NET network programming, with no advanced cryptography prerequisites required. Start mastering secure certificate validation today.