1. Panel discussion: Mix Cascades vs. P2P: Is one concept superior? PET 2004 May 27 2004

2. Cascade topology Free route topology

3. Classification Flexibility of routing Task Sharing System definedUsers choice AsymmetricMix cascadeFree route Mix network SymmetricDC-net Broadcast P2P network

4. Extended classification Flexibility of Routing FixedVariableRestrictedFree AsymmetricA1A1 A2A2 A3A3 A4A4 SymmetricS1S1 S2S2 S3S3 S4S4 System definedUsers choice

5. Anonymity set size –Mix –Network Traffic analysis Robustness / Availability / Exit policies Incentives to cooperate –deployed by volonteers or by professionals? –Number of users Performance –Low-latency / High-latency systems Cost / Resources needed Scalability –Increase number of users –Increase number of mixes / cascades Flexibility / Users choice Attacks –Denial of Service attacks / n-1 attack –Corrupted nodes (trust) –Intersection attacks … Unconditional / Conditional anonymity Restricted Route Networks