In quite a few applications, we'll have a requirement to keep the data in our databases encrypted so that even if somebody gets into the database, they might not understand what the data is. Encrypting is crucial in many applications. With the rise of NoSQL databases these days, we'll take a look at how we can encrypt data going into a MongoDB database from our Spring Boot application. We'll also see how we can decrypt that data after getting it from the database into our application. One thing you need to know before trying this on any production-grade application is that this will slow things down. There are two extra steps involved in this process - encrypting and decrypting the data.