Secure Computation with Sublinear Amortized Work

Traditional approaches to secure computation begin by representing the function f being computed as a circuit. For any function f that depends on each of its inputs, this implies a protocol with complexity at least linear in the input size. In fact, linear running time is inherent for secure computation of non-trivial functions, since each party must “touch” every bit of their input lest information about other party’s input be leaked. This seems to rule out many interesting applications of secure computation in scenarios where at least one of the inputs is huge and sublinear-time algorithms can be utilized in the insecure setting; private database search is a prime example. We present an approach to secure two-party computation that yields sublinear-time protocols, in an amortized sense, for functions that can be computed in sublinear time on a random access machine (RAM). Furthermore, a party whose input is “small” is required to maintain only small state. We provide a gen...

• Type: Journal
• Year: 2011
• Where: IACR
• Authors: S. Dov Gordon, Jonathan Katz, Vladimir Kolesnikov, Tal Malkin, Mariana Raykova, Yevgeniy Vahlis
• Keywords: Generic Protocol, IACR 2011, Sublinear Time, Time Protocols