Introduction You're looking at an older version of this tutorial for an outdated version of our SDKs. Click here to see the new version. In this tutorial, we help you to add end-to-end encryption (E2EE) in your digital solutions like: Messenger App, ChatBot, IoT devices in order to communicate securely.Remember, this is the simplest possible implementation of E2EE chat and it works perfectly for simple chat apps between 2 users where conversations are short-lived and it's okay to lose the message history if a device is lost with the private key on it. For a busier, Slack-like chat app where history is important and users are joining and leaving channels all the time, we’ll build another use case PFS Encrypted Communication.What you'll learn at the end of the tutorialHow to create and publish users' public keys on Virgil Cards Service.How to encrypt chat messages with a receiver's public key before sending.How to decrypt encrypted messages with a sender's private key after receiving.How to create tamper proof signature to be sure of data integrity.We publish the users’ public keys on Virgil Cards Service so that chat users are able to look up each other and encrypt messages for each other or verify signature. The private keys will stay on users' devices.What Virgil provides to developersOpen source Crypto Library. Used to perform cryptographic operations.Virgil Services. For storing and managing users' Public Keys and for the validation of user identities in anything from emails to applications.Virgil SDK Allows you to easily manage a Crypto Library and communicate with Virgil Services.What's needed from developer's sidea backend server for your app.a client-side application.OK, enough talking! Let's get started!