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


In this chapter, we have learned what OpenSSL is and why it’s needed. We also walked through the history of OpenSSL and had a glimpse into its future. We reviewed other TLS libraries and competitors to OpenSSL and highlighted their strengths and weaknesses.

You should now have a better understanding of which TLS library you should choose in any given situation. And if the situation is not special, I recommend that you choose OpenSSL since many other people have chosen the same, which implies that OpenSSL is the most popular TLS library and the de facto industry standard.

Now that you know why you should choose OpenSSL, you need to learn how to use it. The next few chapters will be practical ones in that we will learn how to use OpenSSL’s powerful features – from symmetric encryption to creating TLS connections with X.509 certificates.