Yuval Ishai Joe Kilian Kobbi Nissim Erez Petrank Extending Oblivious Transfers Efficiently. 145-161 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2729&spage=145 2003 conf/crypto/2003 CRYPTO db/conf/crypto/crypto2003.html#IshaiKNP03