  Jamming techniques require just moderate resources to be deployed, while
their effectiveness in disrupting communications is unprecedented. In this
paper we introduce several contributions to jamming mitigation. In particular,
we introduce a novel adversary model that has both (unlimited) jamming reactive
capabilities as well as powerful (but limited) proactive jamming capabilities.
Under this powerful but yet realistic adversary model, the communication
bandwidth provided by current anti-jamming solutions drops to zero. We then
present Silence is Golden (SiG): a novel anti jamming protocol that,
introducing a tunable, asymmetric communication channel, is able to mitigate
the adversary capabilities, enabling the parties to communicate. For instance,
with SiG it is possible to deliver a 128 bits long message with a probability
greater than 99% in 4096 time slots in the presence of a jammer that jams all
the on-the-fly communications and the 74% of the silent radio spectrum---while
competing proposals simply fail. The provided solution enjoys a thorough
theoretical analysis and is supported by extensive experimental results,
showing the viability of our proposal.
