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Re:Vuvuzela – Private messaging system that hides metadata by lazard on Thursday December 03, 2015 @11:55AM (#10670640)
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The latency can be reduced by future work. For example, Section 9 in the paper mentions an idea for reducing the amount of noise (and thus reducing latency) by treating honest users as noise.

Vuvuzela can also be configured with a smaller "privacy budget" to reduce latency.

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