Book Image

Essential Cryptography for JavaScript Developers

By : Alessandro Segala
Book Image

Essential Cryptography for JavaScript Developers

By: Alessandro Segala

Overview of this book

If you’re a software developer, this book will give you an introduction to cryptography, helping you understand how to make the most of it for your applications. The book contains extensive code samples in JavaScript, both for Node.js and for frontend apps running in a web browser, although the core concepts can be used by developers working with any programming language and framework. With a purely hands-on approach that is focused on sharing actionable knowledge, you’ll learn about the common categories of cryptographic operations that you can leverage in all apps you’re developing, including hashing, encryption with symmetric, asymmetric and hybrid ciphers, and digital signatures. You’ll learn when to use these operations and how to choose and implement the most popular algorithms to perform them, including SHA-2, Argon2, AES, ChaCha20-Poly1305, RSA, and Elliptic Curve Cryptography. Later, you’ll learn how to deal with password and key management. All code in this book is written in JavaScript and designed to run in Node.js or as part of frontend apps for web browsers. By the end of this book, you'll be able to build solutions that leverage cryptography to protect user privacy, offer better security against an expanding and more complex threat landscape, help meet data protection requirements, and unlock new opportunities.
Table of Contents (13 chapters)
Part 1 – Getting Started
Part 2 – Using Common Cryptographic Operations with Node.js
Part 3 – Cryptography in the Browser


The need for cryptography in application development is increasing steadily and goes hand-in-hand with the need to build solutions that better protect users' privacy and are safe even from more widespread, complex threats.

This book is designed to help software developers understand how to build common cryptographic operations as part of their solutions and to do so safely, using hashing, symmetric and asymmetric encryption, and digital signatures.

Throughout the book, we focus on the practical aspects that are relevant to all application developers, even those without a background in cryptography. For each class of cryptographic operation, we will learn about the role it plays in improving applications or unlocking new opportunities, which algorithms are commonly used, and what you need to know to be able to use it safely.

Written by a developer for developers, this book contains what I've learned over many years of working with cryptography and implementing applications based on common cryptographic schemes. I've made a conscious decision to skip formal explanations of how algorithms work, including the mathematical formulations behind them, and I'm instead focusing on practical, actionable knowledge that every developer can feel comfortable leveraging as part of the solutions they're building.