Giuseppe Ateniese Reza Curtmola Breno de Medeiros Darren Davis Medical Information Privacy Assurance: Cryptographic and System Aspects. 199-218 2002 conf/scn/2002 SCN http://link.springer.de/link/service/series/0558/bibs/2576/25760199.htm db/conf/scn/scn2002.html#AtenieseCMD02