Cryptology ePrint Archive: Report 2014/224

Whitewash: Outsourcing Garbled Circuit Generation for Mobile Devices

Henry Carter and Charles Lever and Patrick Traynor

Abstract: Garbled circuits offer a powerful primitive for computation on a userís personal data while keeping that data private. Despite recent improvements, constructing and evaluating circuits of any useful size remains expensive on the limited hardware resources of a smartphone, the primary computational device available to most users around the world. In this work, we develop a new technique for securely outsourcing the generation of garbled circuits to a Cloud provider. By outsourcing the circuit generation, we are able to eliminate the most costly operations from the mobile device, including oblivious transfers. After proving the security of our techniques in the malicious model, we experimentally demonstrate that our new protocol, built on this role reversal, decreases execution time by 98% and reduces network costs by as much as 92% compared to previous outsourcing protocols. In so doing, we demonstrate that the use of garbled circuits on mobile devices can be made nearly as practical as it is becoming for server-class machines.

Category / Keywords: cryptographic protocols / server-aided cryptography, multi-party computation, garbled circuits

Original Publication (with major differences): Proceedings of the Annual Computer Security Applications Conference (ACSAC), 2014

Date: received 27 Mar 2014, last revised 19 Nov 2014

Contact author: carterh at gatech edu

Available format(s): PDF | BibTeX Citation

Version: 20141119:163011 (All versions of this report)

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