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


In this chapter, we learned how to perform all the common cryptographic operations we've seen throughout this book in the context of a web browser, with JavaScript code that can be used on the client side. This included calculating digests with SHA-2 (and SHA-1); deriving keys and hashing passphrases with Argon2; encrypting and decrypting data using symmetric ciphers (AES), asymmetric ones (RSA), and hybrid schemes such as ECIES (based on ECDH); and calculating and verifying RSA and ECDSA digital signatures.

This chapter concludes both our exploration of cryptography in the browser and this book. I hope this book helped you learn about using cryptography in a practical way Armed with your newly acquired knowledge, I hope you'll be able to build applications that leverage common cryptographic operations and solutions to deliver better security and privacy to your users.

Thank you for reading, and happy coding!