Lecture
This lecture covers the importance of privacy-preserving systems in the digital age, discussing the threats to online anonymity and the limitations of encryption. It delves into the concept of metadata and its implications, highlighting real-world examples of metadata usage. The instructor explains the need for anonymity online, the threat models faced, and various approaches to achieve anonymity, such as mix networks and Tor. The lecture also explores the Dining Cryptographers protocol as a different approach to information coding for anonymity. Finally, it addresses the challenges and advantages of privacy-preserving systems, emphasizing the trade-offs between security and usability.