Fully Homomorphic Encryption with Polylog Overhead

  title={Fully Homomorphic Encryption with Polylog Overhead},
  author={Craig Gentry and Shai Halevi and Nigel P. Smart},
  journal={IACR Cryptology ePrint Archive},
We show that homomorphic evaluation of (wide enough) arithmetic circuits can be accomplished with only polylogarithmic overhead. Namely, we present a construction of fully homomorphic encryption (FHE) schemes that for security parameter λ can evaluate any width-Ω(λ) circuit with t gates in time t · polylog(λ). To get low overhead, we use the recent batch homomorphic evaluation techniques of Smart-Vercauteren and Brakerski-Gentry-Vaikuntanathan, who showed that homomorphic operations can be… CONTINUE READING
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Fully homomorphic encryption with polylog overhead

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