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

Cascade topology Free route topology

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

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

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