Affiliation: | TU GuoFang1,LIU JianJun1,ZHANG Can1,2,GAO ShaoShuai3 & LI ShiDong4 1School of Information Science , Engineering,Graduate University of Chinese Academy of Sciences,Beijing 100049,China,2State Key Laboratory of Information Security,3National Institute of St,ards , Technology,Gaithersburg,MD 20899,USA,4Department of Mathematics,San Francisco State University,San Francisco,CA 94132 |