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This paper describes UV: a two-node system for unobservable voice communication on the Internet. UV provides unobservability of communication by hiding the fact that there is a conversation taking place. To achieve this, the system uses techniques such as encryption, constant traffic generation, equal packet sizes, and a fixed packet sending schedule. This paper evaluates the influence of the constant traffic generation on the general performance of UV with experiments on the Internet and in a wireless setting simulated with network simulator NS2.
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