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A. Papadopoulos, L. Czap, C. Fragouli.  2015.  "LP formulations for secrecy over erasure networks with feedback". 2015 IEEE International Symposium on Information Theory (ISIT). :954-958.

We design polynomial time schemes for secure message transmission over arbitrary networks, in the presence of an eavesdropper, and where each edge corresponds to an erasure channel with public feedback. Our schemes are described through linear programming (LP) formulations, that explicitly select (possibly different) sets of paths for key-generation and message sending. Although our LPs are not always capacity-achieving, they outperform the best known alternatives in the literature, and extend to incorporate several interesting scenaria.