Identity refers to the digital identity of a person, device, process, or any other object that is part of a digital network. The digital identity is the sum of information that uniquely describes the object and contains information about its properties and relationships to other objects, such as rights (entitlements) to perform certain actions in the digital or physical world. In the past, only people have been given digital identities to communicate in the digital world. Today, we are witnessing the rise of the Internet of Things, where most physical objects, machines, and even services around us are going to be connected in a digital infrastructure. All these objects need an identity to be able to establish trustworthy connections and communicate in the digital network.