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It is impossible to build anonymity system without some sort of centralization due to possibility of Sybil attack. You need some trusted entity beforehand, othe
by ycmbntrthrwaway 10y ago
It is impossible to build anonymity system without some sort of centralization due to possibility of Sybil attack. You need some trusted entity beforehand, otherwise your ISP can just simulate the whole network for you and never let you connect to the real network without you even noticing this.
- sangel 10y agoI'm not sure that I agree with your point. DC networks (see David Chaum's work and also Dissent by Corrigan-Gibbs and Ford) have no centralized components and provide stronger anonymity than Vuvuzela. However, they are not very efficient for large user bases. This is different from being "impossible" though. The attack that you are describing seems to be a denial of service rather than a privacy violation. Centralized systems have similar issues though (your ISP could simply block packets to such system, one of the malicious centralized servers could refuse to process messages, etc.).