Professional C# 7 and .NET Core 2.0, 7th Edition

24Security

WHAT’S IN THIS CHAPTER?

• Authentication and authorization
• Creating and verifying signatures
• Secure data exchange
• Signing and hashing
• Data protection
• Access control to resources
• Web security

WROX.COM CODE DOWNLOADS FOR THIS CHAPTER

The Wrox.com code downloads for this chapter are found at www.wrox.com on the Download Code tab. The source code is also available in the GitHub repository https://github.com/ProfessionalCSharp/ProfessionalCSharp7 in the folder Security. The code for this chapter is divided into the following major examples:

• WindowsPrincipal
• SigningDemo
• SecureTransfer
• RSASample
• DataProtection
• UserSecretsSample
• FileAccessControl
• WebApplicationSecurity

INTRODUCTION

Security has several key elements that you need to consider to make your applications secure. The primary one, of course, is the user of the application. Is the user the person authorized to access the application, or someone posing as the user? How can this user be trusted? As you see in this chapter, ensuring the security of an application in regard of the user is a two-part process: First, users need to be authenticated, and then they need to be authorized to verify that they are allowed to use the requested resources.

What about data that is stored or sent across the network? Is it possible for someone to access this data, for example, by using a network sniffer? Encryption of data is important in this regard. Some technologies, such as Windows Communication Foundation (WCF), ...