C# (.NET) Application Security: From Vulnerability to Protection

The book "C# (.NET) Application Security" is a practical guide for developers striving to create reliable and secure software products on the .NET platform. In today's world of cyber threats, code security is not a luxury but a mandatory requirement. This book will help you understand how attackers target applications and teach you how to effectively counter these attacks.

What is the book about?

The book covers the full security lifecycle of .NET applications: from threat analysis to implementing protective mechanisms. You will learn:

• Key vulnerabilities of web and desktop applications in C# (SQL injection, XSS, CSRF, buffer overflow, etc.);
• Practical data protection methods: symmetric and asymmetric encryption, working with certificates, protecting connection strings;
• Implementing secure authentication and authorization (ASP.NET Identity, JWT, OAuth 2.0, OpenID Connect);
• Protection against memory attacks and exception handling without information leakage;
• Secure interaction with databases, the file system, and the network;
• Using static code analysis (Roslyn Analyzers) and security testing tools.

Who is this book for?

• Beginner C# developers who want to write secure code from the start;
• Experienced programmers looking to systematize their knowledge of .NET application security;
• Architects and team leads responsible for overall product security;
• Students and educators studying modern approaches to information security.

What will you learn after reading?

• How to analyze code for vulnerabilities according to the OWASP Top 10 for .NET;
• How to properly organize the storage of passwords, tokens, and secrets;
• How to protect APIs from unauthorized access and DDoS attacks;
• How to use .NET cryptographic libraries (System.Security.Cryptography);
• How to configure secure logging and monitoring.

Each chapter contains real code examples ready to use in projects. The book is written in simple and clear language, without excessive theory — only practical, working advice. Whether you are building a web application on ASP.NET Core, a desktop application on WPF, or microservices, this book will be your reliable companion in the fight for security.

Note: The book is oriented towards .NET versions 6, 7, and 8, but most examples are also applicable to earlier versions of the platform.