Yeonjung Kang Hyangjin Lee Kilsoo Chun Junghwan Song Classification of Privacy Enhancing Technologies on Life-cycle of Information. 66-70 2007 SECURWARE http://dx.doi.org/10.1109/SECUREWARE.2007.4385312 conf/securware/2007 db/conf/securware/securware2007.html#KangLCS07