Cryptography, Secrets, and Data Protection

Cryptography and secrets management are the foundation of secure .NET applications. Whether you're protecting user passwords, encrypting sensitive data, or managing API keys, understanding how to implement these patterns correctly will prevent breaches, compliance violations, and data loss. This series takes you from the basics of hashing and symmetric encryption through advanced key rotation and Azure Key Vault integration, with every step grounded in real production scenarios and 2026 best practices.

In my 8 years building secure financial systems and cloud applications, I've learned that developers often skip cryptography fundamentals, leading to weak passwords, exposed secrets, and unencrypted configurations. This series fixes that by teaching you exactly what hashing does, when to use AES vs RSA, how the Data Protection API works under the hood, and how to rotate keys without downtime. Each article pairs theory with runnable C# examples so you can apply these patterns to your own code immediately.

Articles in this series

• Understanding Hashing in .NET: Secure Data Storage
• MD5 vs SHA: Choosing the Right Hash Algorithm
• Symmetric Encryption in .NET: AES Explained
• Asymmetric Encryption with RSA: Public Key Cryptography
• Data Protection API: How to Encrypt Application Secrets
• Azure Key Vault Integration: Secure Secret Management
• Environment Variables vs Secrets: Best Practices
• Key Rotation Strategies: Keeping Encryption Keys Fresh
• Implementing TLS/SSL in .NET Applications
• Password Hashing and Salting: User Authentication Security