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Anonymous Communications
This lecture explores anonymous communication systems, focusing on Herbivore, a protocol designed for anonymity. It covers the network and key topology, entry control, and the challenges of maintaining anonymity in open environments. The statistical disclosure attack and the comparison between different attacks are also discussed. Additionally, the lecture delves into the Crowds system, which aims to provide sender anonymity by blending users into a diverse group. Anonymity analysis towards malicious users and servers is presented, along with performance analysis highlighting the trade-offs between anonymity and efficiency.