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Garbled Circuit (GC) is a basic technique for practical secure computation. GC handles Boolean circuits; it consumes significant network bandwidth to transmit encoded gate truth tables, each of which scales with the computational security parameter κ. GC optimizations that reduce bandwidth consumption are valuable. It is natural to consider a generalization of Boolean two-input one-output gates (represented by 4-row one-column lookup tables, LUTs) to arbitrary N-row m-column LUTs. Known techniques for this do not scale, with na¨ıve size-O(Nmκ) garbled LUT being the most practical approach in many scenarios. Our novel garbling scheme – logrow – implements GC LUTs while sending only a logarithmic in N number of ciphertexts! Specifically, let n = ⌈log2 N⌉. We allow the GC parties to evaluate a LUT for (n−1)κ+nmκ+Nm bits of communication. logrow is compatible with modern GC advances, e.g. half gates and free XOR. Our work improves state-of-the-art GC handling of several interesting applications, such as privacypreserving machine learning, floating-point arithmetic, and DFA evaluation.more » « less
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