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Distributed Authorization in Vanadium

In this tutorial, we present an authorization model for distributed systems that operate with limited internet connectivity. Reliable internet access remains a luxury for a majority of the world's population. Even for those who can afford it, a dependence on internet connectivity may lead to sub-optimal user experiences. With a focus on decentralized deployment, we present an authorization model that is suitable for scenarios where devices right next to each other (such as a sensor or a friend's phone) should be able to communicate securely in a peer-to-peer manner. The model has been deployed as part of an open-source distributed application framework called Vanadium. As part of this tutorial, we survey some of the key ideas and techniques used in distributed authorization, and explain how they are combined in the design of our model.