In this chapter, you started by looking at the general concepts surrounding integration before moving on and looking at some of the old and modern integration approaches. You achieved this by looking at different types of tools and mechanisms. You also learned about some ideal use cases for each of these tools. You then moved on to a related architectural topic, that is, security and cryptography. You learned about some key concepts in the wide and complex world of cryptography and tied them back to some real-world examples that you may come across regularly. Finally, you tied all this together and learned how integration and cryptography can work side by side in the enterprise landscape.