Sendr was the result of a research project designed to examine the tradeoffs between security and practicality when implementing distributed systems. Sendr is a distributed messaging application that uses end-to-end RSA public key encryption to facilitate server-blind group chats. Messages are encrypted with other users' public keys as they are sent, and then decrypted by each user using their unique private key that is not shared with any server. This ensures that if one or more of the servers were compromised, the user's messages would remain private. When a user joins a chat, they automatically send their public key to all users in that chat. This prompts each user their public key back to that user, ensuring that users can communicate freely.