Anonymous Communications: Mix Networks

This lecture covers the concept of mix networks, focusing on how to send messages anonymously by hiding sender/receiver identities and message content. It discusses security issues, broken mix designs, strategies for mixing messages, and challenges in distributing mixing. The instructor emphasizes the importance of honesty in mix operation and the need for multiple sender-receiver pairs to ensure anonymity. Solutions to prevent epistemic attacks and active attacks, such as message expiry and heartbeat traffic, are also explored.