Nishanth Chandran Vipul Goyal Rafail Ostrovsky Amit Sahai Covert Multi-Party Computation. 238-248 2007 FOCS http://doi.ieeecomputersociety.org/10.1109/FOCS.2007.21 conf/focs/2007 db/conf/focs/focs2007.html#ChandranGOS07