Svetlin Nakov wrote:This book is designed for developers who write code every day, for software engineers who create software systems, Web applications, mobile apps and other software. It may be useful also for DevOps engineers who deal with crypto algorithms and write code to automate the IT infrastructure, for system administrators, who want to learn practical cryptography better, for information security engineers, who need to deal with cryptography every day and to know which ciphers and crypto algorithms are safe and which are broken, along with the possible attacks, for experienced QA engineers who perform security testing and code reviews about security and cryptography, and for many other IT professionals.

This book is about using crypto algorithms and cryptographic packages, not about designing ciphers, signature schemes and cryptosystems. You will learn how cryptosystems work (without too much math) and how to use them in your daily job. This book is not 100% free of math, but the complexity level is reduced to match the average developer's level, and complex concepts are explained in simplified and understandable style. This book is created by developers for developers, not by university professors or mathematicians. It is about coding in a smart way, with understanding the concepts and using the crypto algorithms and crypto libraries the right way. It is about the modern crypto algorithms and cryptographic techniques, used today in the software industry (as of Nov 2018).

We assume that most developers use higher level programming languages (such as JavaScript, Python, C#, Java and PHP), so most code examples in the book are given in Python, which can be translated to other languages with ease.