The Applied Cryptography knowledge area This document provides a broad introduction to the field of cryptography, focusing on applied aspects of the subject. It complements the CyBoK document [1] which focuses on formal aspects of cryptography (including definitions and proofs) and on describing the core cryptographic primitives. That said, formal aspects are highly relevant when considering applied cryptography. As we shall see, they are increasingly important when it comes to providing security assurance for real-world deployments of cryptography. We speak with CyBOK Applied Cryptography author Kenny Paterson for an overview of the topic.