Shu Qin Ren Dong Seong Kim Jong Sou Park A Secure Data Aggregation Scheme for Wireless Sensor Networks. 32-40 2007 conf/ispa/2007w ISPA Workshops http://dx.doi.org/10.1007/978-3-540-74767-3_4 db/conf/ispa/ispa2007w.html#RenKP07