Book Image

C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development - Fourth Edition

By : Mark J. Price
Book Image

C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development - Fourth Edition

By: Mark J. Price

Overview of this book

In C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development, Fourth Edition, expert teacher Mark J. Price gives you everything you need to start programming C# applications. This latest edition uses the popular Visual Studio Code editor to work across all major operating systems. It is fully updated and expanded with new chapters on Content Management Systems (CMS) and machine learning with ML.NET. The book covers all the topics you need. Part 1 teaches the fundamentals of C#, including object-oriented programming, and new C# 8.0 features such as nullable reference types, simplified switch pattern matching, and default interface methods. Part 2 covers the .NET Standard APIs, such as managing and querying data, monitoring and improving performance, working with the filesystem, async streams, serialization, and encryption. Part 3 provides examples of cross-platform applications you can build and deploy, such as web apps using ASP.NET Core or mobile apps using Xamarin.Forms. The book introduces three technologies for building Windows desktop applications including Windows Forms, Windows Presentation Foundation (WPF), and Universal Windows Platform (UWP) apps, as well as web applications, web services, and mobile apps.
Table of Contents (21 chapters)

Encrypting and decrypting data

In .NET Core, there are multiple encryption algorithms you can choose from.

Some algorithms are implemented by the operating system and their names are suffixed with CryptoServiceProvider. Some algorithms are implemented in .NET Core and their names are suffixed with Managed.

Some algorithms use symmetric keys, and some use asymmetric keys. The main asymmetric encryption algorithm is RSA.

Symmetric encryption algorithms use CryptoStream to encrypt or decrypt large amounts of bytes efficiently. Asymmetric algorithms can only handle small amounts of bytes, stored in a byte array instead of a stream.

The most common symmetric encryption algorithms derive from the abstract class named SymmetricAlgorithm and are shown in the following list:

  • AES
  • DESCryptoServiceProvider
  • TripleDESCryptoServiceProvider
  • RC2CryptoServiceProvider
  • RijndaelManaged

If you need to write code to decrypt some data sent by an external system...