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Non-malleable codes are randomized codes that protect coded messages againstmodification by functions in a tampering function class. These codes aremotivated by providing tamper resilience in applications where a cryptographicsecret is stored in a tamperable storage device and the protection goal is toensure that the adversary cannot benefit from their tamperings with the device.In this paper we consider non-malleable codes for protection of securecommunication against active physical layer adversaries. We define a class offunctions that closely model tampering of communication by adversaries who caneavesdrop on a constant fraction of the transmitted codeword, and use thisinformation to select a vector of tampering functions that will be applied to asecond constant fraction of codeword components (possibly overlapping with thefirst set). We derive rate bounds for non-malleable codes for this functionclass and give two modular constructions. The first construction adapts andprovides new analysis for an existing construction in the new setting. Thesecond construction uses a new approach that results in an explicitconstruction of non-malleable codes. We show applications of our results insecuring message communication against active physical layer adversaries in twosettings: wiretap II with active adversaries and Secure Message Transmission(SMT) in networks. We discuss our results and directions for future work.

Non-Malleable Codes with Leakage and Applications to Secure Communication