C# (.NET) Application Security: Protecting Code and Data from Attacks

Modern development in C# and the .NET platform requires not only creating functional code but also ensuring its protection from external threats. The book "C# (.NET) Application Security" is a comprehensive practical guide that will help you master key aspects of cybersecurity in the Microsoft ecosystem.

What is this book about?

The author thoroughly examines the most common vulnerabilities faced by C# developers. You will learn how attackers can target your application and, most importantly, how to counter this. The book covers the full secure development lifecycle: from architecture design to final code audit.

• Protection against SQL Injection and XSS: detailed examples using Entity Framework, Dapper, and raw SQL queries. You will learn how to properly escape data and use parameterized queries.
• Secure authentication and authorization: implementing JWT, OAuth 2.0, Identity in ASP.NET Core. How to avoid token leaks and protect sessions.
• Data protection at rest and in transit: encrypting connection strings, using Data Protection API, working with certificates and TLS.
• Security auditing and testing: static analysis tools (Roslyn, SonarQube), writing unit tests to check for vulnerabilities, logging suspicious activity.
• Protecting desktop and mobile .NET applications: code obfuscation, protection against reverse engineering, secure storage of keys and secrets.

Who is this book for?

The book will be useful for:

• Junior and Middle C# developers who want to write secure code from day one.
• Team Leads and architects responsible for the security of the entire project.
• Testing specialists (QA) who want to gain a deeper understanding of attack vectors on .NET.
• Students and beginner programmers learning the .NET platform.

What will you learn after reading?

You will be able to independently audit code for common vulnerabilities, configure secure interaction with databases, APIs, and external services. You will learn to apply the principles of Secure by Design and Defense in Depth in your projects. Each chapter contains ready-made code examples that can be immediately used in your work.

The book is written in a lively style, without excessive academicism. All examples are relevant for .NET 6, 7, and 8, as well as for .NET Framework 4.8. If you want your C# application to be not only fast but also secure, this guide will become your reliable assistant.