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Traffic analysis attacks remain a significant problem for online security.Communication between nodes can be observed by network level attackers as itinherently takes place in the open. Despite online services increasingly usingencrypted traffic, the shape of the traffic is not hidden. To prevent trafficanalysis, the shape of a system's traffic must be independent of secrets. Weinvestigate adapting the data-oblivious approach the reactive setting andpresent OblivIO, a secure language for writing reactive programs driven bynetwork events. Our approach pads with dummy messages to hide which programsends are genuinely executed. We use an information-flow type system toprovably enforce timing-sensitive noninterference. The type system is extendedwith potentials to bound the overhead in traffic introduced by our approach. Weaddress challenges that arise from joining data-oblivious and reactiveprogramming and demonstrate the feasibility of our resulting language bydeveloping an interpreter that implements security critical operations asconstant-time algorithms.

OblivIO: Securing reactive programs by oblivious execution with bounded traffic overheads