William Aiello Yuval Ishai Omer Reingold Priced Oblivious Transfer: How to Sell Digital Goods. 119-135 2001 conf/eurocrypt/2001 EUROCRYPT http://link.springer.de/link/service/series/0558/bibs/2045/20450119.htm db/conf/eurocrypt/eurocrypt2001.html#AielloIR01