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Paper:

TR15-056 | 3rd April 2015 05:32

Black-Box Garbled RAM

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TR15-056
Authors: Sanjam Garg, Steve Lu, Rafail Ostrovsky
Publication: 13th April 2015 09:11
Downloads: 904
Keywords: 


Abstract:

Garbled RAM, introduced by Lu and Ostrovsky, enables the task of garbling a RAM (Random Access Machine) program directly, there by avoiding the inefficient process of first converting it into a circuit. Garbled RAM can be seen as a RAM analogue of Yao's garbled circuit construction, except that known realizations of Garbled RAM make non-black-box use of the underlying cryptographic primitives.

In this paper we remove this limitation and provide the first black-box construction of Garbled RAM with polylogarithmic overhead. Our scheme allows for garbling multiple RAM programs being executed on a persistent database and its security is based only on the existence of one-way functions. We also obtain the first secure RAM computation protocol that is both constant round and makes only black-box use of one-way functions in the OT-hybrid model.



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