Book Image

Demystifying Cryptography with OpenSSL 3.0

By : Alexei Khlebnikov
Book Image

Demystifying Cryptography with OpenSSL 3.0

By: Alexei Khlebnikov

Overview of this book

Security and networking are essential features of software today. The modern internet is full of worms, Trojan horses, men-in-the-middle, and other threats. This is why maintaining security is more important than ever. OpenSSL is one of the most widely used and essential open source projects on the internet for this purpose. If you are a software developer, system administrator, network security engineer, or DevOps specialist, you’ve probably stumbled upon this toolset in the past – but how do you make the most out of it? With the help of this book, you will learn the most important features of OpenSSL, and gain insight into its full potential. This book contains step-by-step explanations of essential cryptography and network security concepts, as well as practical examples illustrating the usage of those concepts. You’ll start by learning the basics, such as how to perform symmetric encryption and calculate message digests. Next, you will discover more about cryptography: MAC and HMAC, public and private keys, and digital signatures. As you progress, you will explore best practices for using X.509 certificates, public key infrastructure, and TLS connections. By the end of this book, you’ll be able to use the most popular features of OpenSSL, allowing you to implement cryptography and TLS in your applications and network infrastructure.
Table of Contents (20 chapters)
Part 1: Introduction
Part 2: Symmetric Cryptography
Part 3: Asymmetric Cryptography and Certificates
Part 4: TLS Connections and Secure Communication
Part 5: Running a Mini-CA

Part 4: TLS Connections and Secure Communication

In this part, we will learn about the TLS protocol, the successor of the SSL protocol, why it is needed, and why it is used so much on the modern internet. Then, we will learn how to establish secure communication channels using TLS, send and receive data, and shut them down. We will also learn why X.509 certificates are important for TLS connections and how they counter Man in the Middle attacks. Then, we will find out how to supply a certificate for a TLS connection and how to verify the certificate of a remote party. Working with TLS and certificates will be illustrated using command-line and C code examples.

This part contains the following chapters:

  • Chapter 9, Establishing TLS Connections and Sending Data over Them
  • Chapter 10, Using X.509 Certificates in TLS
  • Chapter 11, Special Usages of TLS