International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 08 June 2015

Marcel Keller, Emmanuela Orsini, Peter Scholl
ePrint Report ePrint Report
We describe an actively secure OT extension protocol in the random oracle model with efficiency very close to the passively secure IKNP protocol of Ishai et al. (Crypto 2003). For computational security parameter $\\kappa$, our protocol requires $\\kappa$ base OTs, and is the first practical, actively secure protocol to match the cost of the passive IKNP extension in this regard. The added communication cost is

only additive in $O(\\kappa)$, independent of the number of OTs being created, while the computation cost is essentially two finite field operations per extended OT. We present implementation results that show our protocol takes no more than 5% more time than the passively secure IKNP extension, in both LAN and WAN environments, and so is essentially optimal with respect to the passive protocol.

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